PT-2026-49564 · Pypi · Aiohttp

Published 2026-06-15 · Updated 2026-06-15 · CVE-2026-50269

OSV

CVSS v4.0

2.7

Low

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U

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

Fix

Weakness Enumeration

CWE-113

CWE-93

Related Identifiers

CVE-2026-50269

GHSA-M6QW-4CW2-HM4M

Affected Products

Aiohttp

References · 4

• https://osv.dev/vulnerability/GHSA-m6qw-4cw2-hm4m · Vendor Advisory
• https://github.com/aio-libs/aiohttp/commit/bf88077ebb14f4c29924b8e8904cba20c55c28b8 · Note
• https://github.com/aio-libs/aiohttp · Note
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m6qw-4cw2-hm4m · Note