Medium
python-aiohttp — security advisory
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.
- Products
- python-aiohttp
- Affected versions
- 0.17.2-1, 0.17.4-1, 0.17.4-1build1, 0.20.2-1, 0.20.2-1ubuntu0.1~esm1, 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, 3.11.16-1, 3.13.1-1, 3.13.3-3, 3.13.3-3ubuntu1, 3.13.3-3ubuntu1+esm1, 3.14.1-4, 3.14.1-5, 3.14.3-1, 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, 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, 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
- Fixed versions
- Not specified
- CVEs
- CVE-2026-59881
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:49 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-59881
python-aiohttp
Fixed versions: Not specified
python-aiohttp
Fixed versions: Not specified
python-aiohttp
Fixed versions: Not specified
python-aiohttp
Fixed versions: Not specified
python-aiohttp
Fixed versions: Not specified
python-aiohttp
Fixed versions: Not specified
python-aiohttp
Fixed versions: Not specified
Complete source record
{
"id": "66614e43de87986b1fd96955ca1b28f95b0265953a6f6960ebf4e1adb7ef89f7",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-59881",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-59881",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-59881",
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{
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{
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"evidence": "/affected/3/versions"
},
{
"value": "3.8.1-4",
"evidence": "/affected/3/versions"
},
{
"value": "3.8.1-4build1",
"evidence": "/affected/3/versions"
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{
"value": "3.8.1-4ubuntu0.2",
"evidence": "/affected/3/versions"
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{
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{
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{
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{
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"evidence": "/affected/5/versions"
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{
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{
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"evidence": "/affected/5/versions"
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{
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"aliases": [
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},
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"3.0.1-1ubuntu0.1~esm4",
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"3.0.1-1ubuntu0.1~esm6",
"3.0.1-1ubuntu0.1~esm7"
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],
"modified": "2026-10-17T12:59:15.074932346Z",
"provider": "osv",
"upstream": [
"CVE-2026-59881"
],
"references": [
"https://ubuntu.com/security/CVE-2026-59881",
"https://www.cve.org/CVERecord?id=CVE-2026-59881",
"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7",
"https://github.com/aio-libs/aiohttp/pull/12978"
]
},
"related_cves": [
{
"value": "CVE-2026-59881",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359542,
"published_at": "2026-07-30T19:18:00+00:00"
}