The remote CentOS Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the python-urllib3-1.26.5-7.el9 build changelog.

  - 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 1.24 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)

  - 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)

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1418 advisory.

    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)

    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 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)

Tenable has extracted the preceding description block directly from the tested product 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 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RLSA-2026:1087 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 RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:1240 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 Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:2717 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 version of AHV installed on the remote host is prior to 10.3.1.5. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AHV-10.3.1.5 advisory.

  - 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)

  - Scrapy versions up to 2.13.2 are vulnerable to a denial of service (DoS) attack due to a flaw in its     brotli decompression implementation. The protection mechanism against decompression bombs fails to     mitigate the brotli variant, allowing remote servers to crash clients with less than 80GB of available     memory. This occurs because brotli can achieve extremely high compression ratios for zero-filled data,     leading to excessive memory consumption during decompression. (CVE-2025-6176)

  - When building nested elements using xml.dom.minidom methods such as appendChild() that have a dependency     on _clear_id_cache() the algorithm is quadratic. Availability can be impacted when building excessively     nested documents. (CVE-2025-12084)

  - The imaplib module, when passed a user-controlled command, can have additional commands injected using     newlines. Mitigation rejects commands containing control characters. (CVE-2025-15366)

  - The poplib module, when passed a user-controlled command, can have additional commands injected using     newlines. Mitigation rejects commands containing control characters. (CVE-2025-15367)

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

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:1241 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 AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:1240 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.

An update of the python3 package has been released.

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

    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)

    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)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization python-pip 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 SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:0255-2 advisory.

    - CVE-2026-21441: Fixed 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 this issue but has instead relied only on the application's self-reported version number.

The Rocky Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the CIQ crlsa-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 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 CentOS Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare CENTOS7:CLSA-2026:1775723090 advisory.

  - 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 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 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
297556	CentOS 9 : python-urllib3-1.26.5-7.el9	Nessus	CentOS Local Security Checks	2026/2/2	2026/2/2	high
298125	Amazon Linux 2023 : python3-urllib3 (ALAS2023-2026-1418)	Nessus	Amazon Linux Local Security Checks	2026/2/5	2026/2/5	high
298632	RockyLinux 9 : python-urllib3 (RLSA-2026:1087)	Nessus	Rocky Linux Local Security Checks	2026/2/11	2026/2/11	high
298802	RockyLinux 8 : fence-agents (RLSA-2026:1240)	Nessus	Rocky Linux Local Security Checks	2026/2/12	2026/2/17	high
299160	RHEL 8 : python-urllib3 (RHSA-2026:2717)	Nessus	Red Hat Local Security Checks	2026/2/16	2026/2/16	high
305293	Nutanix AHV : Multiple Vulnerabilities (NXSA-AHV-10.3.1.5)	Nessus	Misc.	2026/4/8	2026/8/13	high
306653	AlmaLinux 8 : resource-agents (ALSA-2026:1241)	Nessus	Alma Linux Local Security Checks	2026/4/16	2026/4/16	high
306661	AlmaLinux 8 : fence-agents (ALSA-2026:1240)	Nessus	Alma Linux Local Security Checks	2026/4/16	2026/4/16	high
311734	Photon OS 5.0: Python3 PHSA-2026-5.0-0840	Nessus	PhotonOS Local Security Checks	2026/5/2	2026/10/14	high
319369	EulerOS Virtualization 2.12.0 : python-pip (EulerOS-SA-2026-2111)	Nessus	Huawei Local Security Checks	2026/6/6	2026/6/6	high
319402	EulerOS Virtualization 2.12.1 : python-pip (EulerOS-SA-2026-2086)	Nessus	Huawei Local Security Checks	2026/6/6	2026/6/6	high
329284	SUSE SLES15 Security Update : python-urllib3 (SUSE-SU-2026:0255-2)	Nessus	SuSE Local Security Checks	2026/7/24	2026/7/24	high
355227	Rocky Linux 8 [CIQ] Security Update: python3-urllib3 Multiple Vulnerabilities (crlsa-2026_1254)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	high
360584	CentOS Linux 7 [TuxCare] Security Update: python3-pip Multiple Vulnerabilities (CENTOS7:CLSA-2026:1775723090)	Nessus	CentOS Local Security Checks	2026/10/1	2026/10/1	high

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