CVE-2026-34514: AIOHTTP has CRLF injection through multipart part content type header construction

April 1, 2026 (updated April 6, 2026)

An attacker who controls the content_type parameter in aiohttp could use this to inject extra headers or similar exploits.

References

github.com/advisories/GHSA-2vrm-gr82-f7m5
github.com/aio-libs/aiohttp
github.com/aio-libs/aiohttp/commit/9a6ada97e2c6cf1ce31727c6c9fcea17c21f6f06
github.com/aio-libs/aiohttp/releases/tag/v3.13.4
github.com/aio-libs/aiohttp/security/advisories/GHSA-2vrm-gr82-f7m5
nvd.nist.gov/vuln/detail/CVE-2026-34514

Code Behaviors & Features

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