SUSE-SU-2026:20175-1

Vulnerability from csaf_suse - Published: 2026-01-28 16:03 - Updated: 2026-01-28 16:03
Summary
Security update for python-urllib3

Notes

Title of the patch
Security update for python-urllib3
Description of the patch
This update for python-urllib3 fixes the following issues: - CVE-2025-66471: Fixed excessive resource consumption via decompression of highly compressed data in Streaming API (bsc#1254867) - CVE-2025-66418: Fixed resource exhaustion via unbounded number of links in the decompression chain (bsc#1254866)
Patchnames
SUSE-SL-Micro-6.2-212
Terms of use
CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
To clipboard 

{
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      "text": "important"
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    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright 2024 SUSE LLC. All rights reserved.",
      "tlp": {
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    "notes": [
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        "text": "Security update for python-urllib3",
        "title": "Title of the patch"
      },
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        "category": "description",
        "text": "This update for python-urllib3 fixes the following issues:\n\n- CVE-2025-66471: Fixed excessive resource consumption via decompression\n  of highly compressed data in Streaming API (bsc#1254867)\n- CVE-2025-66418: Fixed resource exhaustion via unbounded number of links\n  in the decompression chain (bsc#1254866)\n",
        "title": "Description of the patch"
      },
      {
        "category": "details",
        "text": "SUSE-SL-Micro-6.2-212",
        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
      }
    ],
    "publisher": {
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      "name": "SUSE Product Security Team",
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    "references": [
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        "summary": "SUSE ratings",
        "url": "https://www.suse.com/support/security/rating/"
      },
      {
        "category": "self",
        "summary": "URL of this CSAF notice",
        "url": "https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_20175-1.json"
      },
      {
        "category": "self",
        "summary": "URL for SUSE-SU-2026:20175-1",
        "url": "https://www.suse.com/support/update/announcement/2026/suse-su-202620175-1/"
      },
      {
        "category": "self",
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        "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-February/024008.html"
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      {
        "category": "self",
        "summary": "SUSE Bug 1254866",
        "url": "https://bugzilla.suse.com/1254866"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1254867",
        "url": "https://bugzilla.suse.com/1254867"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2025-66418 page",
        "url": "https://www.suse.com/security/cve/CVE-2025-66418/"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2025-66471 page",
        "url": "https://www.suse.com/security/cve/CVE-2025-66471/"
      }
    ],
    "title": "Security update for python-urllib3",
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      "id": "SUSE-SU-2026:20175-1",
      "initial_release_date": "2026-01-28T16:03:29Z",
      "revision_history": [
        {
          "date": "2026-01-28T16:03:29Z",
          "number": "1",
          "summary": "Current version"
        }
      ],
      "status": "final",
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    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "python313-urllib3-2.5.0-160000.4.1.noarch",
                "product": {
                  "name": "python313-urllib3-2.5.0-160000.4.1.noarch",
                  "product_id": "python313-urllib3-2.5.0-160000.4.1.noarch"
                }
              }
            ],
            "category": "architecture",
            "name": "noarch"
          },
          {
            "branches": [
              {
                "category": "product_name",
                "name": "SUSE Linux Micro 6.2",
                "product": {
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                  "product_id": "SUSE Linux Micro 6.2",
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  },
  "vulnerabilities": [
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      "cve": "CVE-2025-66418",
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        {
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          "text": "https://www.suse.com/security/cve/CVE-2025-66418"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "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.",
          "title": "CVE description"
        }
      ],
      "product_status": {
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      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2025-66418",
          "url": "https://www.suse.com/security/cve/CVE-2025-66418"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1254866 for CVE-2025-66418",
          "url": "https://bugzilla.suse.com/1254866"
        }
      ],
      "remediations": [
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          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Micro 6.2:python313-urllib3-2.5.0-160000.4.1.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.2:python313-urllib3-2.5.0-160000.4.1.noarch"
          ]
        }
      ],
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          "date": "2026-01-28T16:03:29Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2025-66418"
    },
    {
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      "ids": [
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          "text": "https://www.suse.com/security/cve/CVE-2025-66471"
        }
      ],
      "notes": [
        {
          "category": "general",
          "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": "CVE description"
        }
      ],
      "product_status": {
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        ]
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        {
          "category": "external",
          "summary": "CVE-2025-66471",
          "url": "https://www.suse.com/security/cve/CVE-2025-66471"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1254867 for CVE-2025-66471",
          "url": "https://bugzilla.suse.com/1254867"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Micro 6.2:python313-urllib3-2.5.0-160000.4.1.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.2:python313-urllib3-2.5.0-160000.4.1.noarch"
          ]
        }
      ],
      "threats": [
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          "category": "impact",
          "date": "2026-01-28T16:03:29Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2025-66471"
    }
  ]
}


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  • 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.



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