Vulnerability-Lookup

RHSA-2026:2060

Vulnerability from csaf_redhat - Published: 2026-02-05 09:42 - Updated: 2026-02-12 17:45

Summary

Red Hat Security Advisory: python-s3transfer security update

Notes

Topic

An update for python-s3transfer is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details

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 Streaming API improperly handles highly compressed data (CVE-2025-66471) 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.

This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

JSON

To clipboard

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        "text": "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.\n\nSecurity Fix(es):\n\n* urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)\n\nFor 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.",
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  "vulnerabilities": [
    {
      "cve": "CVE-2025-66471",
      "cwe": {
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        "name": "Improper Handling of Highly Compressed Data (Data Amplification)"
      },
      "discovery_date": "2025-12-05T17:02:21.597728+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2419467"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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\u0027s 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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "urllib3: urllib3 Streaming API improperly handles highly compressed data",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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        }
      ],
      "product_status": {
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          "7Server-ResilientStorage-ELS:python-s3transfer-0:0.1.13-1.el7_9.5.noarch",
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419467"
        },
        {
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          "url": "https://www.cve.org/CVERecord?id=CVE-2025-66471"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-66471",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66471"
        },
        {
          "category": "external",
          "summary": "https://github.com/urllib3/urllib3/commit/c19571de34c47de3a766541b041637ba5f716ed7",
          "url": "https://github.com/urllib3/urllib3/commit/c19571de34c47de3a766541b041637ba5f716ed7"
        },
        {
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          "summary": "https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37",
          "url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37"
        }
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      "release_date": "2025-12-05T16:06:08.531000+00:00",
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          "date": "2026-02-05T09:42:45+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "7Server-HighAvailability-ELS:python-s3transfer-0:0.1.13-1.el7_9.5.src",
            "7Server-ResilientStorage-ELS:python-s3transfer-0:0.1.13-1.el7_9.5.noarch",
            "7Server-ResilientStorage-ELS:python-s3transfer-0:0.1.13-1.el7_9.5.src"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:2060"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
          "product_ids": [
            "7Server-HighAvailability-ELS:python-s3transfer-0:0.1.13-1.el7_9.5.noarch",
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            "7Server-ResilientStorage-ELS:python-s3transfer-0:0.1.13-1.el7_9.5.noarch",
            "7Server-ResilientStorage-ELS:python-s3transfer-0:0.1.13-1.el7_9.5.src"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "7Server-HighAvailability-ELS:python-s3transfer-0:0.1.13-1.el7_9.5.src",
            "7Server-ResilientStorage-ELS:python-s3transfer-0:0.1.13-1.el7_9.5.noarch",
            "7Server-ResilientStorage-ELS:python-s3transfer-0:0.1.13-1.el7_9.5.src"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "urllib3: urllib3 Streaming API improperly handles highly compressed data"
    }
  ]
}

CVE-2025-66471 (GCVE-0-2025-66471)

Vulnerability from cvelistv5 – Published: 2025-12-05 16:06 – Updated: 2025-12-05 19:33

Title

urllib3 Streaming API improperly handles highly compressed data

Summary

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.

Severity ?

8.9 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

GitHub_M

References

URL

Tags

	https://github.com/urllib3/urllib3/security/advis…	x_refsource_CONFIRM
	https://github.com/urllib3/urllib3/commit/c19571d…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	urllib3	urllib3	Affected: >= 1.0, < 2.6.0

Show details on NVD website

JSON

To clipboard

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                  },
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                "timestamp": "2025-12-05T19:32:57.089218Z",
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

RHSA-2026:2060

CVE-2025-66471 (GCVE-0-2025-66471)

Tags

Sightings

Nomenclature