The remote AlmaLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the ALSA-2026:1254 advisory.

    * urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion (CVE-2025-66418)
      * urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)
      * urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects     (streaming API) (CVE-2026-21441)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 RockyLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RLSA-2026:1226 advisory.

    * urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion (CVE-2025-66418)

    * urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)

    * urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects     (streaming API) (CVE-2026-21441)

Tenable has extracted the preceding description block directly from the RockyLinux 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0443-1 advisory.

    - CVE-2025-66471: excessive resource consumption via decompression of highly compressed data in Streaming     API (bsc#1254867).
    - CVE-2025-66418: resource exhaustion via unbounded number of links in the decompression chain     (bsc#1254866).
    - CVE-2026-21441: excessive resource consumption during decompression of data in HTTP redirect responses     (bsc#1256331).

Tenable has extracted the preceding description block directly from the SUSE 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 Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:2718 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):

    * urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion (CVE-2025-66418)

    * urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)

    * urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects     (streaming API) (CVE-2026-21441)

    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 these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:2728 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):

    * urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion (CVE-2025-66418)

    * urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)

    * urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects     (streaming API) (CVE-2026-21441)

    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 these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:2723 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):

    * urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion (CVE-2025-66418)

    * urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)

    * urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects     (streaming API) (CVE-2026-21441)

    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 these issues but has instead relied only on the application's self-reported version number.

According to the versions of the python-urllib3 package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    urllib3 is an HTTP client library for Python. urllib3's streaming API is designed for the efficient     handling of large HTTP responses by reading the content in chunks, rather than loading the entire response     body into memory at once. urllib3 can perform decoding or decompression based on the HTTP `Content-     Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library     decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and     prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to     drain the connection and decompress the content unnecessarily. This decompression occurred even before any     read methods were called, and configured read limits did not restrict the amount of decompressed data. As     a result, there was no safeguard against decompression bombs. A malicious server could exploit this to     trigger excessive resource consumption on the client. Applications and libraries are affected when they     stream content from untrusted sources by setting `preload_content=False` when they do not disable     redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content     of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable     redirects by setting `redirect=False` for requests to untrusted source.(CVE-2026-21441)

    urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.0 and prior to 2.6.0, the     Streaming API improperly handles highly compressed data. urllib3's streaming API is designed for the     efficient handling of large HTTP responses by reading the content in chunks, rather than loading the     entire response body into memory at once. When streaming a compressed response, urllib3 can perform     decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd).
    The library must read compressed data from the network and decompress it until the requested chunk size is     met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for     the next read operation. The decompression logic could cause urllib3 to fully decode a small amount of     highly compressed data in a single operation. This can result in excessive resource consumption (high CPU     usage and massive memory allocation for the decompressed data.(CVE-2025-66471)

    urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0,     the number of links in the decompression chain was unbounded allowing a malicious server to insert a     virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation     for the decompressed data. This vulnerability is fixed in 2.6.0.(CVE-2025-66418)

Tenable has extracted the preceding description block directly from the EulerOS python-urllib3 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 Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-2b6dfd7c83 advisory.

    Update to 2.6.3, fixes CVE-2025-66471, CVE-2025-21441, CVE-2025-66418.

Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-8b7270b473 advisory.

    Update to 2.6.3, fixes CVE-2025-66471, CVE-2025-21441, CVE-2025-66418.

Tenable has extracted the preceding description block directly from the Fedora 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 Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:1240 advisory.

    The fence-agents packages provide a collection of scripts for handling remote power management for cluster     devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster.

    Security Fix(es):

    * urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion (CVE-2025-66418)

    * urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)

    * urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects     (streaming API) (CVE-2026-21441)

    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 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.

  - urllib3 is an HTTP client library for Python. urllib3's streaming API is designed for the efficient     handling of large HTTP responses by reading the content in chunks, rather than loading the entire response     body into memory at once. urllib3 can perform decoding or decompression based on the HTTP `Content-     Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library     decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and     prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to     drain the connection and decompress the content unnecessarily. This decompression occurred even before any     read methods were called, and configured read limits did not restrict the amount of decompressed data. As     a result, there was no safeguard against decompression bombs. A malicious server could exploit this to     trigger excessive resource consumption on the client. Applications and libraries are affected when they     stream content from untrusted sources by setting `preload_content=False` when they do not disable     redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content     of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable     redirects by setting `redirect=False` for requests to untrusted source. (CVE-2026-21441)

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

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
297138	AlmaLinux 8 : python-urllib3 (ALSA-2026:1254)	Nessus	Alma Linux Local Security Checks	2026/1/29	2026/1/29	high
298619	RockyLinux 8 : python3.12-urllib3 (RLSA-2026:1226)	Nessus	Rocky Linux Local Security Checks	2026/2/11	2026/2/11	high
298731	SUSE SLED15 / SLES15 Security Update : python-urllib3 (SUSE-SU-2026:0443-1)	Nessus	SuSE Local Security Checks	2026/2/12	2026/2/12	high
299156	RHEL 8 : python-urllib3 (RHSA-2026:2718)	Nessus	Red Hat Local Security Checks	2026/2/16	2026/2/16	high
299161	RHEL 8 : python-urllib3 (RHSA-2026:2728)	Nessus	Red Hat Local Security Checks	2026/2/16	2026/2/16	high
299188	RHEL 8 : python-urllib3 (RHSA-2026:2723)	Nessus	Red Hat Local Security Checks	2026/2/16	2026/2/16	high
302421	EulerOS 2.0 SP10 : python-urllib3 (EulerOS-SA-2026-1322)	Nessus	Huawei Local Security Checks	2026/3/16	2026/3/16	high
297447	Fedora 42 : mingw-python-urllib3 (2026-2b6dfd7c83)	Nessus	Fedora Local Security Checks	2026/1/31	2026/1/31	high
297448	Fedora 43 : mingw-python-urllib3 (2026-8b7270b473)	Nessus	Fedora Local Security Checks	2026/1/31	2026/1/31	high
306714	RHEL 8 : fence-agents (RHSA-2026:1240)	Nessus	Red Hat Local Security Checks	2026/4/16	2026/4/16	high
282456	Linux Distros Unpatched Vulnerability : CVE-2026-21441	Nessus	Misc.	2026/1/8	2026/4/29	high

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