CVE-2026-50269Low▾ Sunlitaiohttp: CRLF injection in multipart headers
▾ Sunlit zone — Low / medium · no exploitation signal
impact 13.8 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Jul 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.3%
Last analysed / modified upstream
0.3% → 0.5%
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.
CVE-2023-49082Medium· 5.3aiohttp is an asynchronous HTTP client/server framework for asyncio and Python
CVE-2026-111065Medium· 6.9AIOHTTP: Connector pool exhaustion via Max-Age overflow
CVE-2026-111748Medium· 6.3AIOHTTP: Absolute-form request targets can spoof Request.scheme
CVE-2026-111749Low· 2.3AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies
CVE-2026-111750Medium· 6.3AIOHTTP: Pure-Python parser request smuggling
GHSA-2g87-pp6c-29x5Highaiohttp: Multiple instances of excessive or unbounded memory/CPU use