UBUNTU-CVE-2026-77528 (CVE-2026-77528)

Vulnerability from osv_ubuntu – Published: 2026-09-18 20:17 – Updated: 2026-09-23 23:35 – Source website
VLAI
Details

Autobahn Python is a WebSocket and WAMP implementation for Python that supports Twisted and asyncio. Prior to 26.7.1, WebSocket endpoints that accept permessage-deflate and rely on maxMessagePayloadSize enforce that limit against the compressed frame length before inflation but do not recheck the decompressed message size before delivery. A remote unauthenticated client can send a valid compressed frame below the configured wire-size limit that expands beyond the application message limit, causing oversized data to be allocated, joined, validated, and passed to application callbacks. This can create resource-exhaustion pressure, but the advisory does not establish confidentiality or integrity impact. This issue is fixed in version 26.7.1.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-autobahn",
            "binary_version": "0.10.3+dfsg1-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "python-autobahn",
        "purl": "pkg:deb/ubuntu/python-autobahn@0.10.3+dfsg1-5?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.10.3+dfsg1-2",
        "0.10.3+dfsg1-3",
        "0.10.3+dfsg1-5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-autobahn",
            "binary_version": "17.10.1+dfsg1-2"
          },
          {
            "binary_name": "python3-autobahn",
            "binary_version": "17.10.1+dfsg1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "python-autobahn",
        "purl": "pkg:deb/ubuntu/python-autobahn@17.10.1+dfsg1-2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.14.1+dfsg1-2ubuntu1",
        "17.10.1+dfsg1-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-autobahn",
            "binary_version": "17.10.1+dfsg1-6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python-autobahn",
        "purl": "pkg:deb/ubuntu/python-autobahn@17.10.1+dfsg1-6?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "17.10.1+dfsg1-5",
        "17.10.1+dfsg1-6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-autobahn",
            "binary_version": "21.11.1+dfsg1-2build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-autobahn",
        "purl": "pkg:deb/ubuntu/python-autobahn@21.11.1+dfsg1-2build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "17.10.1+dfsg1-7",
        "21.11.1+dfsg1-2",
        "21.11.1+dfsg1-2build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-autobahn",
            "binary_version": "22.7.1+dfsg1-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "python-autobahn",
        "purl": "pkg:deb/ubuntu/python-autobahn@22.7.1+dfsg1-4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "22.7.1+dfsg1-3",
        "22.7.1+dfsg1-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-autobahn",
            "binary_version": "24.4.2+dfsg1-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "python-autobahn",
        "purl": "pkg:deb/ubuntu/python-autobahn@24.4.2+dfsg1-5?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "23.1.2+dfsg1-2",
        "24.4.2+dfsg1-4",
        "24.4.2+dfsg1-5"
      ]
    }
  ],
  "aliases": [],
  "details": "Autobahn Python is a WebSocket and WAMP implementation for Python that supports Twisted and asyncio. Prior to 26.7.1, WebSocket endpoints that accept permessage-deflate and rely on maxMessagePayloadSize enforce that limit against the compressed frame length before inflation but do not recheck the decompressed message size before delivery. A remote unauthenticated client can send a valid compressed frame below the configured wire-size limit that expands beyond the application message limit, causing oversized data to be allocated, joined, validated, and passed to application callbacks. This can create resource-exhaustion pressure, but the advisory does not establish confidentiality or integrity impact. This issue is fixed in version 26.7.1.",
  "id": "UBUNTU-CVE-2026-77528",
  "modified": "2026-09-23T23:35:44Z",
  "published": "2026-09-18T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-77528"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-77528"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/crossbario/autobahn-python/security/advisories/GHSA-hxp9-w8x3-p566"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/crossbario/autobahn-python/pull/1916"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/crossbario/autobahn-python/commit/77d323a30b09b1828ad8be2ce6344e056970e613"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/crossbario/autobahn-python/releases/tag/v26_7_1"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-77528"
  ]
}



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