This update for libxml2 fixes the following issues :

  - CVE-2017-9050: heap-based buffer overflow     (xmlDictAddString func) [bsc#1039069, bsc#1039661]

  - CVE-2017-9049: heap-based buffer overflow     (xmlDictComputeFastKey func) [bsc#1039066]

  - CVE-2017-9048: stack overflow vulnerability     (xmlSnprintfElementContent func) [bsc#1039063]

  - CVE-2017-9047: stack overflow vulnerability     (xmlSnprintfElementContent func) [bsc#1039064]

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities were discovered in libxml2, a library providing support to read, modify and write XML and HTML files. A remote attacker could provide a specially crafted XML or HTML file that, when processed by an application using libxml2, would cause a denial-of-service against the application, information leaks, or potentially, the execution of arbitrary code with the privileges of the user running the application.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3424-1 advisory.

    It was discovered that a type confusion error existed in libxml2. An attacker could use this to specially     construct XML data that could cause a denial of service or possibly execute arbitrary code.
    (CVE-2017-0663)

    It was discovered that libxml2 did not properly validate parsed entity references. An attacker could use     this to specially construct XML data that could expose sensitive information. (CVE-2017-7375)

    It was discovered that a buffer overflow existed in libxml2 when handling HTTP redirects. An attacker     could use this to specially construct XML data that could cause a denial of service or possibly execute     arbitrary code. (CVE-2017-7376)

    Marcel Bhme and Van-Thuan Pham discovered a buffer overflow in libxml2 when handling elements. An     attacker could use this to specially construct XML data that could cause a denial of service or possibly     execute arbitrary code. (CVE-2017-9047)

    Marcel Bhme and Van-Thuan Pham discovered a buffer overread in libxml2 when handling elements. An     attacker could use this to specially construct XML data that could cause a denial of service.
    (CVE-2017-9048)

    Marcel Bhme and Van-Thuan Pham discovered multiple buffer overreads in libxml2 when handling parameter-     entity references. An attacker could use these to specially construct XML data that could cause a denial     of service. (CVE-2017-9049, CVE-2017-9050)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the version of the libxml2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - A buffer overflow was discovered in libxml2     20904-GITv2.9.4-16-g0741801. The function     xmlSnprintfElementContent in valid.c is supposed to     recursively dump the element content definition into a     char buffer 'buf' of size 'size'. The variable len is     assigned strlen(buf). If the content-i1/4ztype is     XML_ELEMENT_CONTENT_ELEMENT, then (i) the     content-i1/4zprefix is appended to buf (if it actually     fits) whereupon (ii) content-i1/4zname is written to the     buffer. However, the check for whether the     content-i1/4zname actually fits also uses 'len' rather     than the updated buffer length strlen(buf). This allows     us to write about 'size' many bytes beyond the     allocated memory. This vulnerability causes programs     that use libxml2, such as PHP, to crash.(CVE-2017-9047)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

libxml2 developers report :

The htmlParseTryOrFinish function in HTMLparser.c in libxml2 2.9.4 allows attackers to cause a denial of service (buffer over-read) or information disclosure.

A buffer overflow was discovered in libxml2 20904-GITv2.9.4-16-g0741801. The function xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a char buffer 'buf' of size 'size'. The variable len is assigned strlen(buf). If the content->type is XML_ELEMENT_CONTENT_ELEMENT, then (i) the content->prefix is appended to buf (if it actually fits) whereupon (ii) content->name is written to the buffer. However, the check for whether the content->name actually fits also uses 'len' rather than the updated buffer length strlen(buf). This allows us to write about 'size' many bytes beyond the allocated memory. This vulnerability causes programs that use libxml2, such as PHP, to crash.

libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a stack-based buffer overflow. The function xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a char buffer 'buf' of size 'size'. At the end of the routine, the function may strcat two more characters without checking whether the current strlen(buf) + 2 < size. This vulnerability causes programs that use libxml2, such as PHP, to crash.

libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer over-read in the xmlDictComputeFastKey function in dict.c. This vulnerability causes programs that use libxml2, such as PHP, to crash.
This vulnerability exists because of an incomplete fix for libxml2 Bug 759398.

libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer over-read in the xmlDictAddString function in dict.c. This vulnerability causes programs that use libxml2, such as PHP, to crash.
This vulnerability exists because of an incomplete fix for CVE-2016-1839.

This update for libxml2 fixes the following issues: Security issues fixed :

  - CVE-2017-9050: heap-based buffer overflow     (xmlDictAddString func) [bsc#1039069, bsc#1039661]

  - CVE-2017-9049: heap-based buffer overflow     (xmlDictComputeFastKey func) [bsc#1039066]

  - CVE-2017-9048: stack overflow vulnerability     (xmlSnprintfElementContent func) [bsc#1039063]

  - CVE-2017-9047: stack overflow vulnerability     (xmlSnprintfElementContent func) [bsc#1039064] A     clarification for the previously released update: For     CVE-2016-9318 we decided not to ship a fix since it can     break existing setups. Please take appropriate actions     if you parse untrusted XML files and use the new

-noxxe flag if possible (bnc#1010675, bnc#1013930).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Update to 2.9.7 which hopefully fixes all security issues

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of AIX installed on the remote host is prior to APAR IJ54873. It is, therefore, affected by multiple vulnerabilities as referenced in the IJ54873 advisory.

  - A buffer overflow was discovered in libxml2 20904-GITv2.9.4-16-g0741801. The function     xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a     char buffer 'buf' of size 'size'. The variable len is assigned strlen(buf). If the content->type is     XML_ELEMENT_CONTENT_ELEMENT, then (i) the content->prefix is appended to buf (if it actually fits)     whereupon (ii) content->name is written to the buffer. However, the check for whether the content->name     actually fits also uses 'len' rather than the updated buffer length strlen(buf). This allows us to write     about size many bytes beyond the allocated memory. This vulnerability causes programs that use libxml2,     such as PHP, to crash. (CVE-2017-9047)

  - libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a stack-based buffer overflow in xmlSnprintfElements     in valid.c. To exploit this, DTD validation must occur for an untrusted document or untrusted DTD. NOTE:
    this is similar to CVE-2017-9047. (CVE-2025-24928)

  - libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a NULL pointer dereference in xmlPatMatch in     pattern.c. (CVE-2025-27113)

  - libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a use-after-free in xmlSchemaIDCFillNodeTables and     xmlSchemaBubbleIDCNodeTables in xmlschemas.c. To exploit this, a crafted XML document must be validated     against an XML schema with certain identity constraints, or a crafted XML schema must be used.
    (CVE-2024-56171)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of AIX installed on the remote host is prior to APAR IJ54679. It is, therefore, affected by multiple vulnerabilities as referenced in the IJ54679 advisory.

  - A buffer overflow was discovered in libxml2 20904-GITv2.9.4-16-g0741801. The function     xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a     char buffer 'buf' of size 'size'. The variable len is assigned strlen(buf). If the content->type is     XML_ELEMENT_CONTENT_ELEMENT, then (i) the content->prefix is appended to buf (if it actually fits)     whereupon (ii) content->name is written to the buffer. However, the check for whether the content->name     actually fits also uses 'len' rather than the updated buffer length strlen(buf). This allows us to write     about size many bytes beyond the allocated memory. This vulnerability causes programs that use libxml2,     such as PHP, to crash. (CVE-2017-9047)

  - libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a stack-based buffer overflow in xmlSnprintfElements     in valid.c. To exploit this, DTD validation must occur for an untrusted document or untrusted DTD. NOTE:
    this is similar to CVE-2017-9047. (CVE-2025-24928)

  - libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a NULL pointer dereference in xmlPatMatch in     pattern.c. (CVE-2025-27113)

  - libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a use-after-free in xmlSchemaIDCFillNodeTables and     xmlSchemaBubbleIDCNodeTables in xmlschemas.c. To exploit this, a crafted XML document must be validated     against an XML schema with certain identity constraints, or a crafted XML schema must be used.
    (CVE-2024-56171)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of AIX installed on the remote host is prior to APAR IJ54779. It is, therefore, affected by multiple vulnerabilities as referenced in the IJ54779 advisory.

  - A buffer overflow was discovered in libxml2 20904-GITv2.9.4-16-g0741801. The function     xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a     char buffer 'buf' of size 'size'. The variable len is assigned strlen(buf). If the content->type is     XML_ELEMENT_CONTENT_ELEMENT, then (i) the content->prefix is appended to buf (if it actually fits)     whereupon (ii) content->name is written to the buffer. However, the check for whether the content->name     actually fits also uses 'len' rather than the updated buffer length strlen(buf). This allows us to write     about size many bytes beyond the allocated memory. This vulnerability causes programs that use libxml2,     such as PHP, to crash. (CVE-2017-9047)

  - libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a stack-based buffer overflow in xmlSnprintfElements     in valid.c. To exploit this, DTD validation must occur for an untrusted document or untrusted DTD. NOTE:
    this is similar to CVE-2017-9047. (CVE-2025-24928)

  - libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a NULL pointer dereference in xmlPatMatch in     pattern.c. (CVE-2025-27113)

  - libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a use-after-free in xmlSchemaIDCFillNodeTables and     xmlSchemaBubbleIDCNodeTables in xmlschemas.c. To exploit this, a crafted XML document must be validated     against an XML schema with certain identity constraints, or a crafted XML schema must be used.
    (CVE-2024-56171)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of [ncurses,openldap,libxml2,ruby] packages for PhotonOS has been released.

This update for libxml2 fixes the following security issues :

  - CVE-2017-9050: A heap-based buffer over-read in     xmlDictAddString (bsc#1039069, bsc#1039661)

  - CVE-2017-9049: A heap-based buffer overflow in     xmlDictComputeFastKey (bsc#1039066)

  - CVE-2017-9048: A stack overflow vulnerability in     xmlSnprintfElementContent (bsc#1039063)

  - CVE-2017-9047: A stack overflow vulnerability in     xmlSnprintfElementContent (bsc#1039064)

This update was imported from the SUSE:SLE-12-SP2:Update update project.

The remote host is affected by the vulnerability described in GLSA-201711-01 (libxml2: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in libxml2. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker, by enticing a user to process a specially crafted XML       document, could remotely execute arbitrary code, conduct XML External       Entity (XXE) attacks, or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4064 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4064-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                         Tobias Frost     February 22, 2025                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : libxml2     Version        : 2.9.10+dfsg-6.7+deb11u6     CVE ID         : CVE-2022-49043 CVE-2023-39615 CVE-2023-45322 CVE-2024-25062                      CVE-2024-56171 CVE-2025-24928 CVE-2025-27113     Debian Bug     : 1051230 1053629 1063234 1094238 1098320 1098321 1098322

    Multiple vulnerabilities have been found in libxml2, a library providing     support to read, modify and write XML and HTML files. These     vulnerabilities could potentially lead to denial of servie or other     unintended behaviors.

    CVE-2022-49043

        xmlXIncludeAddNode in xinclude.c in libxml2 before 2.11.0 has a         use-after-free.

    CVE-2023-39615

        libxml2 v2.11.0 was discovered to contain an out-of-bounds read via         the xmlSAX2StartElement() function at /libxml2/SAX2.c. This         vulnerability allows attackers to cause a Denial of Service (DoS)         via supplying a crafted XML file. NOTE: the vendor's position is         that the product does not support the legacy SAX1 interface with         custom callbacks; there is a crash even without crafted input.

    CVE-2023-45322

        libxml2 through 2.11.5 has a use-after-free that can only occur         after a certain memory allocation fails. This occurs in         xmlUnlinkNode in tree.c. NOTE: the vendor's position is I don't         think these issues are critical enough to warrant a CVE ID ...
        because an attacker typically can't control when memory allocations         fail.

    CVE-2024-25062

        An issue was discovered in libxml2 before 2.11.7 and 2.12.x before         2.12.5. When using the XML Reader interface with DTD validation and         XInclude expansion enabled, processing crafted XML documents can         lead to an xmlValidatePopElement use-after-free.

    CVE-2024-56171

        libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a use-after-free         in xmlSchemaIDCFillNodeTables and xmlSchemaBubbleIDCNodeTables in         xmlschemas.c. To exploit this, a crafted XML document must be         validated against an XML schema with certain identity constraints,         or a crafted XML schema must be used.

    CVE-2025-24928

        libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a stack-based         buffer overflow in xmlSnprintfElements in valid.c. To exploit this,         DTD validation must occur for an untrusted document or untrusted         DTD. NOTE: this is similar to CVE-2017-9047.

    CVE-2025-27113

        libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a NULL pointer         dereference in xmlPatMatch in pattern.c.

    For Debian 11 bullseye, these problems have been fixed in version     2.9.10+dfsg-6.7+deb11u6.

    We recommend that you upgrade your libxml2 packages.

    For the detailed security status of libxml2 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libxml2

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A buffer overflow was discovered in libxml2 20904-GITv2.9.4-16-g0741801. The function     xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a     char buffer 'buf' of size 'size'. The variable len is assigned strlen(buf). If the content->type is     XML_ELEMENT_CONTENT_ELEMENT, then (i) the content->prefix is appended to buf (if it actually fits)     whereupon (ii) content->name is written to the buffer. However, the check for whether the content->name     actually fits also uses 'len' rather than the updated buffer length strlen(buf). This allows us to write     about size many bytes beyond the allocated memory. This vulnerability causes programs that use libxml2,     such as PHP, to crash. (CVE-2017-9047)

Note that Nessus relies on the presence of the package as reported by the vendor.

According to its self-reported version, the Nessus Network Monitor running on the remote host is prior to 6.2.2. It is, therefore, affected by multiple vulnerabilities as referenced in the TNS-2023-23 advisory. Several of the third-party components were found to contain vulnerabilities, and updated versions have been made available by the providers. Out of caution and in line with best practice, Tenable has opted to upgrade these components to address the potential impact of the issues. Nessus Network Monitor 6.2.2 updates the following components:

  - c-ares from version 1.10.0 to version 1.19.1.
  - curl from version 7.79.1 to version 8.1.2.
  - libbzip2 from version 1.0.6 to version 1.0.8.
  - libpcre from version 8.42 to version 8.44.
  - libxml2 from version 2.7.7 to version 2.11.1.
  - libxslt from version 1.1.26 to version 1.1.37.
  - libxmlsec from version 1.2.18 to version 1.2.37.
  - sqlite from version 3.27.2 to version 3.40.1.
  - jQuery Cookie from version 1.3.1 to version 1.4.1.
  - jQuery UI from version 1.13.0 to version 1.13.2.
  - OpenSSL from version 3.0.8 to version 3.0.9.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
100867	SUSE SLES12 Security Update : libxml2 (SUSE-SU-2017:1587-1)	Nessus	SuSE Local Security Checks	2017/6/19	2025/12/16	high
102685	Debian DSA-3952-1 : libxml2 - security update	Nessus	Debian Local Security Checks	2017/8/23	2025/11/26	critical
103327	Ubuntu 14.04 LTS / 16.04 LTS : libxml2 vulnerabilities (USN-3424-1)	Nessus	Ubuntu Local Security Checks	2017/9/19	2024/8/27	critical
103739	EulerOS 2.0 SP1 : libxml2 (EulerOS-SA-2017-1237)	Nessus	Huawei Local Security Checks	2017/10/10	2025/11/19	high
105216	FreeBSD : libxml2 -- Multiple Issues (76e59f55-4f7a-4887-bcb0-11604004163a)	Nessus	FreeBSD Local Security Checks	2017/12/14	2025/11/12	critical
100780	SUSE SLES11 Security Update : libxml2 (SUSE-SU-2017:1557-1)	Nessus	SuSE Local Security Checks	2017/6/14	2025/12/16	medium
106828	Fedora 26 : libxml2 (2018-a6b59d8f78)	Nessus	Fedora Local Security Checks	2018/2/15	2025/10/29	critical
237753	AIX : Multiple Vulnerabilities (IJ54873)	Nessus	AIX Local Security Checks	2025/6/4	2025/6/4	high
237755	AIX : Multiple Vulnerabilities (IJ54679)	Nessus	AIX Local Security Checks	2025/6/4	2025/6/4	high
237756	AIX : Multiple Vulnerabilities (IJ54779)	Nessus	AIX Local Security Checks	2025/6/4	2025/6/4	high
111873	Photon OS 1.0: Libxml2 / Ncurses / Openldap / Ruby PHSA-2017-0024 (deprecated)	Nessus	PhotonOS Local Security Checks	2018/8/17	2019/2/7	critical
100884	openSUSE Security Update : libxml2 (openSUSE-2017-711)	Nessus	SuSE Local Security Checks	2017/6/20	2025/12/16	high
104492	GLSA-201711-01 : libxml2: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2017/11/10	2025/11/14	critical
106521	Fedora 27 : libxml2 (2018-db610fff5b)	Nessus	Fedora Local Security Checks	2018/1/31	2025/10/30	critical
216663	Debian dla-4064 : libxml2 - security update	Nessus	Debian Local Security Checks	2025/2/22	2025/10/17	critical
221648	Linux Distros Unpatched Vulnerability : CVE-2017-9047	Nessus	Misc.	2025/3/4	2025/9/29	high
177842	Nessus Network Monitor < 6.2.2 Multiple Vulnerabilities (TNS-2023-23)	Nessus	Misc.	2023/6/30	2023/7/6	critical

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