UBUNTU-CVE-2026-59881 (CVE-2026-59881)

Vulnerability from osv_ubuntu – Published: 2026-07-30 19:18 – Updated: 2026-08-06 00:20 – Source website
VLAI
Details

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.

Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-aiohttp",
            "binary_version": "0.20.2-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "python-aiohttp",
        "purl": "pkg:deb/ubuntu/python-aiohttp@0.20.2-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.17.2-1",
        "0.17.4-1",
        "0.17.4-1build1",
        "0.20.2-1",
        "0.20.2-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-aiohttp",
            "binary_version": "3.0.1-1ubuntu0.1~esm7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "python-aiohttp",
        "purl": "pkg:deb/ubuntu/python-aiohttp@3.0.1-1ubuntu0.1~esm7?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.3-1build1",
        "2.2.3-2",
        "2.3.6-1",
        "3.0.1-1",
        "3.0.1-1ubuntu0.1~esm1",
        "3.0.1-1ubuntu0.1~esm4",
        "3.0.1-1ubuntu0.1~esm5",
        "3.0.1-1ubuntu0.1~esm6",
        "3.0.1-1ubuntu0.1~esm7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-aiohttp",
            "binary_version": "3.6.2-1ubuntu1+esm6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "python-aiohttp",
        "purl": "pkg:deb/ubuntu/python-aiohttp@3.6.2-1ubuntu1+esm6?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.5.4-1",
        "3.5.4-1build1",
        "3.6.1-1",
        "3.6.2-1",
        "3.6.2-1build1",
        "3.6.2-1ubuntu0.1~esm1",
        "3.6.2-1ubuntu1",
        "3.6.2-1ubuntu1+esm1",
        "3.6.2-1ubuntu1+esm3",
        "3.6.2-1ubuntu1+esm4",
        "3.6.2-1ubuntu1+esm5",
        "3.6.2-1ubuntu1+esm6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-aiohttp",
            "binary_version": "3.8.1-4ubuntu0.2+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "python-aiohttp",
        "purl": "pkg:deb/ubuntu/python-aiohttp@3.8.1-4ubuntu0.2+esm3?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.7.4-1",
        "3.7.4-1build2",
        "3.8.1-3",
        "3.8.1-4",
        "3.8.1-4build1",
        "3.8.1-4ubuntu0.2",
        "3.8.1-4ubuntu0.2+esm1",
        "3.8.1-4ubuntu0.2+esm2",
        "3.8.1-4ubuntu0.2+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-aiohttp",
            "binary_version": "3.9.1-1ubuntu0.1+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "python-aiohttp",
        "purl": "pkg:deb/ubuntu/python-aiohttp@3.9.1-1ubuntu0.1+esm3?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.8.4-1",
        "3.9.1-1",
        "3.9.1-1build1",
        "3.9.1-1ubuntu0.1",
        "3.9.1-1ubuntu0.1+esm1",
        "3.9.1-1ubuntu0.1+esm2",
        "3.9.1-1ubuntu0.1+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-aiohttp",
            "binary_version": "3.13.3-3ubuntu1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "python-aiohttp",
        "purl": "pkg:deb/ubuntu/python-aiohttp@3.13.3-3ubuntu1+esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.11.16-1",
        "3.13.1-1",
        "3.13.3-3",
        "3.13.3-3ubuntu1",
        "3.13.3-3ubuntu1+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.",
  "id": "UBUNTU-CVE-2026-59881",
  "modified": "2026-08-06T00:20:57Z",
  "published": "2026-07-30T19:18:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-59881"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-59881"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/aio-libs/aiohttp/pull/12978"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-59881"
  ]
}



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