HighFix available
python-aiohttp — security advisory
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. An attacker controlled server, or possibly an accidental response, could trigger a DoS in the client. The vulnerable path was error message construction in aiohttp/_http_parser.pyx, where an llhttp error-position pointer was used to build a snippet for malformed chunked responses and malformed request or response bytes at the buffer end. This issue is fixed in version 3.14.3.
- Products
- python-aiohttp
- Affected versions
- 3.11.16-1, 3.11.16-1+deb13u1, 3.12.15-1, 3.13.0-1, 3.13.1-1, 3.13.3-1, 3.13.3-2, 3.13.3-3, 3.13.5-1, 3.14.0-1, 3.14.1-1, 3.14.1-2, 3.14.1-3, 3.14.1-4, 3.14.1-5, 3.14.3-1
- Fixed versions
- 3.14.3-1
- CVEs
- CVE-2026-69244
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:05 UTC · Revision 1
Source evidence
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. An attacker controlled server, or possibly an accidental response, could trigger a DoS in the client. The vulnerable path was error message construction in aiohttp/_http_parser.pyx, where an llhttp error-position pointer was used to build a snippet for malformed chunked responses and malformed request or response bytes at the buffer end. This issue is fixed in version 3.14.3.
osv:DEBIAN-CVE-2026-69244
python-aiohttp
Fixed versions: Not specified
python-aiohttp
Fixed versions: 3.14.3-1
Complete source record
{
"id": "5e22d4ff26bb906584bb2c371c0ba57d195cb372f815513b0158341396cf337c",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-69244",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-69244",
"summary": "AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. An attacker controlled server, or possibly an accidental response, could trigger a DoS in the client. The vulnerable path was error message construction in aiohttp/_http_parser.pyx, where an llhttp error-position pointer was used to build a snippet for malformed chunked responses and malformed request or response bytes at the buffer end. This issue is fixed in version 3.14.3.",
"evidence": "osv:DEBIAN-CVE-2026-69244",
"products": [
{
"name": {
"value": "python-aiohttp",
"evidence": "/affected/0/package/name"
},
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"fixed_versions": [],
"affected_versions": [
{
"value": "3.11.16-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.11.16-1+deb13u1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
"name": {
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
},
{
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{
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}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-69244",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
}
],
"affected": [
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"package": {
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"ecosystem": "Debian:13"
},
"versions": [
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"3.13.3-3",
"3.13.5-1",
"3.14.0-1",
"3.14.1-1",
"3.14.1-2",
"3.14.1-3",
"3.14.1-4",
"3.14.1-5",
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"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-69244.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.14.3-1"
}
]
}
],
"package": {
"name": "python-aiohttp",
"purl": "pkg:deb/debian/python-aiohttp?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.11.16-1",
"3.12.15-1",
"3.13.0-1",
"3.13.1-1",
"3.13.3-1",
"3.13.3-2",
"3.13.3-3",
"3.13.5-1",
"3.14.0-1",
"3.14.1-1",
"3.14.1-2",
"3.14.1-3",
"3.14.1-4",
"3.14.1-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-69244.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-24T09:47:27.601948910Z",
"provider": "osv",
"upstream": [
"CVE-2026-69244"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-69244"
]
},
"related_cves": [
{
"value": "CVE-2026-69244",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 428964,
"published_at": "2026-08-03T21:16:42.273+00:00"
}