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GHSA-mwh4-6h8g-pg8w

AIOHTTP has HTTP response splitting via \r in reason phrase

Source: GitHub Advisory Database (reviewed) Low CVE-2026-34519

Packages

EcosystemPackageAffectedFixed in
PyPI aiohttp < 3.13.4 3.13.4

Details

As written in the advisory (Markdown source, shown as plain text).

### 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

External links from the advisory. They lead to third-party sites.