High
python-aiohttp — security advisory
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.0, attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. In the unlikely situation that an application is passing user-controlled strings into MultipartWriter.append(headers=...) or Payload.headers, then an attacker may be able to modify the request to inject headers or change the contents of the request. This vulnerability is fixed in 3.14.0.
- 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, 3.10.11-1build1, 3.11.16-1, 3.11.16-1ubuntu0.1, 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-2026-50269
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:24 UTC · Revision 1
Source evidence
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.0, attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. In the unlikely situation that an application is passing user-controlled strings into MultipartWriter.append(headers=...) or Payload.headers, then an attacker may be able to modify the request to inject headers or change the contents of the request. This vulnerability is fixed in 3.14.0.
osv:UBUNTU-CVE-2026-50269
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
python-aiohttp
Fixed versions: Not specified
Complete source record
{
"id": "fe2f5e9a50259ad7a72394346c13f9145143e9055f87cf6e1c24fc3922dbcaf9",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-50269",
"method": "structured",
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"summary": "AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.0, attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. In the unlikely situation that an application is passing user-controlled strings into MultipartWriter.append(headers=...) or Payload.headers, then an attacker may be able to modify the request to inject headers or change the contents of the request. This vulnerability is fixed in 3.14.0.",
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],
"modified": "2026-10-17T12:54:36.286404553Z",
"provider": "osv",
"upstream": [
"CVE-2026-50269"
],
"references": [
"https://ubuntu.com/security/CVE-2026-50269",
"https://www.cve.org/CVERecord?id=CVE-2026-50269",
"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m6qw-4cw2-hm4m"
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},
"related_cves": [
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"value": "CVE-2026-50269",
"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 353530,
"published_at": "2026-06-22T18:16:00+00:00"
}