{
"id": "GHSA-mq44-7p77-q5h7",
"aliases": [
"CVE-2026-59881"
],
"details": "### Summary\n\nThe client accepts and decompresses frames with the RSV1 bit set even when the `permessage-deflate` extension was not negotiated.\n\n### Impact\n\nA client may unexpectedly decompress WebSocket frames when explicitly opted out. This could lead to additional CPU/memory consumption, but is unlikely to be a significant issue unless a zip bomb vulnerability or similar is also present.\n\n---\n\nPatch: https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6",
"summary": "AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.14.2"
}
]
}
],
"package": {
"name": "aiohttp",
"ecosystem": "PyPI"
},
"database_specific": {
"last_known_affected_version_range": "<= 3.14.1"
}
}
],
"modified": "2026-08-03T20:40:55Z",
"severity": [
{
"type": "CVSS_V4",
"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"
}
],
"published": "2026-08-03T20:40:55Z",
"references": [
{
"url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59881",
"type": "ADVISORY"
},
{
"url": "https://github.com/aio-libs/aiohttp/pull/12978",
"type": "WEB"
},
{
"url": "https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6",
"type": "WEB"
},
{
"url": "https://github.com/aio-libs/aiohttp",
"type": "PACKAGE"
},
{
"url": "http://github.com/aio-libs/aiohttp/releases/tag/v3.14.2",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-20"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": "2026-07-30T19:18:33Z",
"github_reviewed_at": "2026-08-03T20:40:55Z"
}
}