CVE-2026-50269Low▾ Sunlitaiohttp: CRLF injection in multipart headers
▾ Sunlit zone — Low / medium · no exploitation signal
impact 13.8 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 7.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.3%
Last analysed / modified upstream
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.
Sanitise such user input.
Patch: https://github.com/aio-libs/aiohttp/commit/bf88077ebb14f4c29924b8e8904cba20c55c28b8
aiohttp < 3.14.0Upgrade to a patched release:
aiohttp 3.14.0Connected by shared product, vendor, weakness, or advisory.
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