GitHub Advisoryadvisory · PyPI

GHSA-m6qw-4cw2-hm4m aiohttp: CRLF injection in multipart headers

LOW Published 2026-06-15 Modified 2026-06-15 Official page ↗
Aliases
CVE-2026-50269
Ecosystem
PyPI
Packages
aiohttp
Severity
Low
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Weaknesses
CWE-113, CWE-93
Reviewed
2026-06-15

Affected packages

• PyPI aiohttp: < 3.14.0 → fixed in 3.14.0

Description

Summary Attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. Impact 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. Workaround Sanitise such user input. ----- Patch: https://github.com/aio-libs/aiohttp/commit/bf88077ebb14f4c29924b8e8904cba20c55c28b8

Related

Alias · CVE (1)

  • CVE-2026-50269 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. vulnerability

Weakness · CWE (2)

  • CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers weakness
  • CWE-93 Improper Neutralization of CRLF Sequences weakness

References