The version of libxml2 installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-6021 advisory.

  - A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations     can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of     service when processing crafted input. (CVE-2025-6021)

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

The version of libxml2 installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-6021 advisory.

  - A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations     can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of     service when processing crafted input. (CVE-2025-6021)

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

The Rocky Linux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_1391 advisory.

    This advisory aggregates security fixes for the libxml2 SRPM in CIQ LTS 9.6. It addresses 39 CVEs:
    CVE-2010-4494, CVE-2009-2414, CVE-2015-7498, CVE-2022-40304, CVE-2024-25062, and 34 more.

Tenable has extracted the preceding description block directly from the CIQ 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 version of AIX installed on the remote host is prior to APAR IJ55269. It is, therefore, affected by multiple vulnerabilities as referenced in the IJ55269 advisory.

  - A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can     trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that     can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to     sensitive data being corrupted in memory. (CVE-2025-49796)

  - A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under     certain circumstances when the XML schematron has the <sch:name path=.../> schema elements. This flaw     allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the     program's crash using libxml or other possible undefined behaviors. (CVE-2025-49794)

  - A NULL pointer dereference vulnerability was found in libxml2 when processing XPath XML expressions. This     flaw allows an attacker to craft a malicious XML input to libxml2, leading to a denial of service.
    (CVE-2025-49795)

  - A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations     can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of     service when processing crafted input. (CVE-2025-6021)

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 AHV installed on the remote host is prior to 10.0.1.3. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AHV-10.0.1.3 advisory.

  - LZ4 before 1.9.2 has a heap-based buffer overflow in LZ4_write32 (related to LZ4_compress_destSize),     affecting applications that call LZ4_compress_fast with a large input. (This issue can also lead to data     corruption.) NOTE: the vendor states only a few specific / uncommon usages of the API are at risk.
    (CVE-2019-17543)

  - setuptools is a package that allows users to download, build, install, upgrade, and uninstall Python     packages. A path traversal vulnerability in `PackageIndex` is present in setuptools prior to version     78.1.1. An attacker would be allowed to write files to arbitrary locations on the filesystem with the     permissions of the process running the Python code, which could escalate to remote code execution     depending on the context. Version 78.1.1 fixes the issue. (CVE-2025-47273)

  - A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under     certain circumstances when the XML schematron has the <sch:name path=.../> schema elements. This flaw     allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the     program's crash using libxml or other possible undefined behaviors. (CVE-2025-49794)

  - A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can     trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that     can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to     sensitive data being corrupted in memory. (CVE-2025-49796)

  - A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations     can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of     service when processing crafted input. (CVE-2025-6021)

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 AHV installed on the remote host is prior to 10.3.0.2. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AHV-10.3.0.2 advisory.

  - LZ4 before 1.9.2 has a heap-based buffer overflow in LZ4_write32 (related to LZ4_compress_destSize),     affecting applications that call LZ4_compress_fast with a large input. (This issue can also lead to data     corruption.) NOTE: the vendor states only a few specific / uncommon usages of the API are at risk.
    (CVE-2019-17543)

  - setuptools is a package that allows users to download, build, install, upgrade, and uninstall Python     packages. A path traversal vulnerability in `PackageIndex` is present in setuptools prior to version     78.1.1. An attacker would be allowed to write files to arbitrary locations on the filesystem with the     permissions of the process running the Python code, which could escalate to remote code execution     depending on the context. Version 78.1.1 fixes the issue. (CVE-2025-47273)

  - A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under     certain circumstances when the XML schematron has the <sch:name path=.../> schema elements. This flaw     allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the     program's crash using libxml or other possible undefined behaviors. (CVE-2025-49794)

  - A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can     trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that     can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to     sensitive data being corrupted in memory. (CVE-2025-49796)

  - A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations     can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of     service when processing crafted input. (CVE-2025-6021)

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

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
243018	CBL Mariner 2.0 Security Update: libxml2 (CVE-2025-6021)	Nessus	MarinerOS Local Security Checks	2025/7/30	2026/1/21	high
243025	Azure Linux 3.0 Security Update: libxml2 (CVE-2025-6021)	Nessus	Azure Linux Local Security Checks	2025/7/30	2026/1/21	high
354769	Rocky Linux 9.6 [CIQ] Security Update: libxml2 / libxml2-devel / python3-libxml2 Multiple Vulnerabilities (ciqsa-2026_1391)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/12	critical
242258	AIX : Multiple Vulnerabilities (IJ55269)	Nessus	AIX Local Security Checks	2025/7/17	2026/10/16	critical
258029	Nutanix AHV : Multiple Vulnerabilities (NXSA-AHV-10.0.1.3)	Nessus	Misc.	2025/8/27	2026/8/13	high
261687	Nutanix AHV : Multiple Vulnerabilities (NXSA-AHV-10.3.0.2)	Nessus	Misc.	2025/9/8	2026/7/27	high

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