AIOHTTP has HTTP response splitting via \r in reason phrase
GHSA-mwh4-6h8g-pg8w · CVE-2026-34519 · PYSEC-2026-2101
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Description
Summary
An attacker who controls the reason parameter when creating a Response may be able to inject extra headers or similar exploits.
Impact
In the unlikely situation that an application allows untrusted data to be used in the response's reason parameter, then an attacker could manipulate the response to send something different from what the developer intended.
Patch: https://github.com/aio-libs/aiohttp/commit/53b35a2f8869c37a133e60bf1a82a1c01642ba2b
References
- WEB https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mwh4-6h8g-pg8w
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-34519
- WEB https://github.com/aio-libs/aiohttp/commit/53b35a2f8869c37a133e60bf1a82a1c01642ba2b
- PACKAGE https://github.com/aio-libs/aiohttp
- WEB https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
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