The remote Fedora 33 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2021-3342569a0f advisory.

  - A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to     arbitrary code execution when it processes untrusted YAML files through the full_load method or with the     FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this     flaw. An attacker could use this flaw to execute arbitrary code on the system by abusing the     python/object/new constructor. (CVE-2020-1747)

  - A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to     arbitrary code execution when it processes untrusted YAML files through the full_load method or with the     FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this     flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the     python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747. (CVE-2020-14343)

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

An update of the PyYAML package has been released.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:4702 advisory.

    Red Hat Satellite is a systems management tool for Linux-based     infrastructure. It allows for provisioning, remote management, and     monitoring of multiple Linux deployments with a single centralized tool.

    Security Fix(es):
    * python-ecdsa: Unexpected and undocumented exceptions during signature decoding (CVE-2019-14853)
    * python-ecdsa: DER encoding is not being verified in signatures (CVE-2019-14859)
    * rubygem-activerecord-session_store: hijack sessions by using timing attacks targeting the session id     (CVE-2019-25025)
    * rake: OS Command Injection via egrep in Rake::FileList (CVE-2020-8130)
    * candlepin: guava - local information disclosure via temporary directory created with unsafe permissions     (CVE-2020-8908)
    * PyYAML: incomplete fix for CVE-2020-1747 (CVE-2020-14343)
    * tfm-rubygem-nokogiri: XML external entity injection via Nokogiri::XML::Schema (CVE-2020-26247)
    * tfm-rubygem-foreman_azure_rm: Azure compute resource secret_key leak to authenticated users     (CVE-2021-3413)
    * foreman: possible man-in-the-middle in smart_proxy realm_freeipa (CVE-2021-3494)
    * foreman: BMC controller credential leak via API (CVE-2021-20256)
    * python-aiohttp: Open redirect in aiohttp.web_middlewares.normalize_path_middleware (CVE-2021-21330)
    * rubygem-actionpack: Possible Information Disclosure / Unintended Method Execution in Action Pack     (CVE-2021-22885)
    * tfm-rubygem-actionpack: rails: Possible Denial of Service vulnerability in Action Dispatch     (CVE-2021-22902)
    * tfm-rubygem-actionpack: Possible DoS Vulnerability in Action Controller Token Authentication     (CVE-2021-22904)
    * python-django: potential directory-traversal via uploaded files (CVE-2021-28658)
    * tfm-rubygem-puma: incomplete fix for CVE-2019-16770 allows Denial of Service (DoS) (CVE-2021-29509)
    * python-django: Potential directory-traversal via uploaded files (CVE-2021-31542)
    * tfm-rubygem-addressable: ReDoS in templates (CVE-2021-32740)
    * python-django: Potential directory traversal via ``admindocs`` (CVE-2021-33203)
    * python-urllib3: ReDoS in the parsing of authority part of URL (CVE-2021-33503)
    * python-django: Possible indeterminate SSRF, RFI, and LFI attacks since validators accepted leading zeros     in IPv4 addresses (CVE-2021-33571)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE     page(s) listed in the References section.

    Additional Changes:

    * Updated Content Management backend with Pulp 3 for increased performance, scale and reliability. MongoDB     is also removed from Satellite
    * Adds support for Azure GovCloud
    * Provides Satellite 6.10 Server support for Satellite 6.9 Capsules
    * Improves support for Satellite Air Gapped and Disconnected environments
    * Adds Ansible Collections content type to support disconnected environments
    * Foreman_webhooks introduced to replace foreman_hooks
    * Introduces UI to manage Personal Access Tokens
    * Adds ability to configure Pulp repository synchronization timeouts
    * Support for Convert2RHEL
    * Provides advanced options when registering a host
    * Supports remediation playbook signatures from console.redhat.com
    * Red Hat Insights Plugin replaced through new integration within Satellite
    * Ability to visually represent systems registered and in sync with Insights
    * Ability to verify if required packages are installed as part of pre-upgrade check
    * Ability to unset environment variables when installer is running
    * Ability to turn backups on and off when cleaning up tasks from database

    The items above are not a complete list of changes. This update also fixes     several bugs and adds various enhancements. Documentation for these changes     is available from the Release Notes document linked to in the References     section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 remote Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2021:2583 advisory.

  - A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to     arbitrary code execution when it processes untrusted YAML files through the full_load method or with the     FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this     flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the     python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747. (CVE-2020-14343)

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

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:2583 advisory.

    Python is an interpreted, interactive, object-oriented programming language, which includes modules,     classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to     many system calls and libraries, as well as to various windowing systems.

    Security Fix(es):

    * PyYAML: incomplete fix for CVE-2020-1747 (CVE-2020-14343)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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 PyYAML 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-2020-14343 advisory.

  - A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to     arbitrary code execution when it processes untrusted YAML files through the full_load method or with the     FullLoader loader. Applications that use the library to process untrusted input May be vulnerable to this     flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the     python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747. (CVE-2020-14343)

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

The remote host is affected by the vulnerability described in GLSA-202402-33 (PyYAML: Arbitrary Code Execution)

  - A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to     arbitrary code execution when it processes untrusted YAML files through the full_load method or with the     FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this     flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the     python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747. (CVE-2020-14343)

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

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2024:0269 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2017-18342:
    In PyYAML before 5.1, the yaml.load() API could execute arbitrary code if used with untrusted data. The     load() function has been deprecated in version 5.1 and the 'UnsafeLoader' has been introduced for backward     compatibility with the function.

    CVE-2020-14343:
    A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to     arbitrary code execution when it processes untrusted YAML files through the full_load method or with the     FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this     flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the     python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747.

    CVE-2020-1747:
    A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to     arbitrary code execution when it processes untrusted YAML files through the full_load method or with the     FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this     flaw. An attacker could use this flaw to execute arbitrary code on the system by abusing the     python/object/new constructor.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux 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 remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2024:0262 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2019-18874:
    psutil (aka python-psutil) through 5.6.5 can have a double free. This occurs because of refcount     mishandling within a while or for loop that converts system data into a Python object.

    CVE-2019-20477:
    PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a     class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists     because of an incomplete fix for CVE-2017-18342.

    CVE-2019-20907:
    In Lib/tarfile.py in Python through 3.8.3, an attacker is able to craft a TAR archive leading to an     infinite loop when opened by tarfile.open, because _proc_pax lacks header validation.

    CVE-2020-14343:
    A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to     arbitrary code execution when it processes untrusted YAML files through the full_load method or with the     FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this     flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the     python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747.

    CVE-2020-14422:
    Lib/ipaddress.py in Python through 3.8.3 improperly computes hash values in the IPv4Interface and     IPv6Interface classes, which might allow a remote attacker to cause a denial of service if an application     is affected by the performance of a dictionary containing IPv4Interface or IPv6Interface objects, and this     attacker can cause many dictionary entries to be created. This is fixed in: v3.5.10, v3.5.10rc1; v3.6.12;
    v3.7.9; v3.8.4, v3.8.4rc1, v3.8.5, v3.8.6, v3.8.6rc1; v3.9.0, v3.9.0b4, v3.9.0b5, v3.9.0rc1, v3.9.0rc2.

    CVE-2020-27619:
    In Python 3 through 3.9.0, the Lib/test/multibytecodec_support.py CJK codec tests call eval() on content     retrieved via HTTP.

    CVE-2020-8492:
    Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1     allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client     because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

    CVE-2021-23336:
    The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before     3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and     urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query     parameters using a semicolon (;), they can cause a difference in the interpretation of the request between     the proxy (running with default configuration) and the server. This can result in malicious requests being     cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and     therefore would not include it in a cache key of an unkeyed parameter.

    CVE-2021-29921:
    In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP     address string. This (in some situations) allows attackers to bypass access control that is based on IP     addresses.

    CVE-2021-3177:
    Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to     remote code execution in certain Python applications that accept floating-point numbers as untrusted     input, as demonstrated by a 1e300 argument to c_double.from_param. This occurs because sprintf is used     unsafely.

    CVE-2021-3426:
    There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince     another local or adjacent user to start a pydoc server could access the server and use it to disclose     sensitive information belonging to the other user that they would not normally be able to access. The     highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9,     Python versions before 3.9.3 and Python versions before 3.10.0a7.

    CVE-2021-3733:
    There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP     server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of     Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the     server to the client. The greatest threat that this flaw poses is to application availability.

    CVE-2021-3737:
    A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may     allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop,     consuming CPU time. The highest threat from this vulnerability is to system availability.

    CVE-2021-43818:
    lxml is a library for processing XML and HTML in the Python language. Prior to version 4.6.5, the HTML     Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG     files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should     upgrade to lxml 4.6.5 to receive a patch. There are no known workarounds available.

    CVE-2022-0391:
    A flaw was found in Python, specifically within the urllib.parse module. This module helps break Uniform     Resource Locator (URL) strings into components. The issue involves how the urlparse method does not     sanitize input and allows characters like '\r' and '\n' in the URL path. This flaw allows an attacker to     input a crafted URL, leading to injection attacks. This flaw affects Python versions prior to 3.10.0b1,     3.9.5, 3.8.11, 3.7.11 and 3.6.14.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux 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 remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-2583 advisory.

    - Rebase to version 5.4.1 to fix CVE-2020-14343

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

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

According to the version of the PyYAML package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - A vulnerability was discovered in the PyYAML library in     versions before 5.4, where it is susceptible to     arbitrary code execution when it processes untrusted     YAML files through the full_load method or with the     FullLoader loader. Applications that use the library to     process untrusted input may be vulnerable to this flaw.
    This flaw allows an attacker to execute arbitrary code     on the system by abusing the python/object/new     constructor. This flaw is due to an incomplete fix for     CVE-2020-1747.(CVE-2020-14343)

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.

The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2021:2583 advisory.

    * PyYAML: incomplete fix for CVE-2020-1747 (CVE-2020-14343)

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

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

The remote MiracleLinux 8 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2021-2388:01 advisory.

    PyYAML: incomplete fix for CVE-2020-1747 (CVE-2020-14343)     Modularity name: python38     Stream name: 3.8

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

Note that Nessus has not tested for this issue 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
145367	Fedora 33 : PyYAML (2021-3342569a0f)	Nessus	Fedora Local Security Checks	2021/1/25	2025/12/2	critical
146772	Photon OS 1.0: Pyyaml PHSA-2021-1.0-0361	Nessus	PhotonOS Local Security Checks	2021/2/23	2025/12/2	critical
155377	RHEL 7 : Satellite 6.10 Release (Moderate) (RHSA-2021:4702)	Nessus	Red Hat Local Security Checks	2021/11/17	2024/11/7	critical
157771	Rocky Linux 8 : python38:3.8 and python38-devel:3.8 (RLSA-2021:2583)	Nessus	Rocky Linux Local Security Checks	2022/2/9	2025/12/2	critical
165162	RHEL 8 : python38:3.8 and python38-devel:3.8 (RHSA-2021:2583)	Nessus	Red Hat Local Security Checks	2022/9/15	2025/12/2	critical
185499	CBL Mariner 2.0 Security Update: PyYAML (CVE-2020-14343)	Nessus	MarinerOS Local Security Checks	2023/11/13	2025/12/2	critical
190999	GLSA-202402-33 : PyYAML: Arbitrary Code Execution	Nessus	Gentoo Local Security Checks	2024/2/26	2025/12/2	critical
235945	Alibaba Cloud Linux 3 : 0269: PyYAML (ALINUX3-SA-2024:0269)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	critical
236082	Alibaba Cloud Linux 3 : 0262: python38:3.8 and python38-devel:3.8 (ALINUX3-SA-2024:0262)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	critical
151279	Oracle Linux 8 : python38:3.8 / and / python38-devel:3.8 (ELSA-2021-2583)	Nessus	Oracle Linux Local Security Checks	2021/7/2	2025/12/2	critical
151330	EulerOS Virtualization for ARM 64 3.0.2.0 : PyYAML (EulerOS-SA-2021-2078)	Nessus	Huawei Local Security Checks	2021/7/2	2025/12/2	critical
157659	AlmaLinux 8 : python38:3.8 and python38-devel:3.8 (ALSA-2021:2583)	Nessus	Alma Linux Local Security Checks	2022/2/9	2025/12/2	critical
294184	MiracleLinux 8 : python38:3.8 (AXSA:2021-2388:01)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	critical

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