https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-09-28T16:46:41.527924+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/cve-2026-34519 CVE-2026-34519 — AIOHTTP: HTTP response splitting via \r in reason phrase 2026-09-28T16:46:41.530818+00:00

Affected: aio-libs aiohttp

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the reason parameter when creating a Response may be able to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.

 https://vulnerability.circl.lu/vuln/ghsa-mwh4-6h8g-pg8w GHSA-mwh4-6h8g-pg8w — AIOHTTP has HTTP response splitting via \r in reason phrase 2026-09-28T16:46:41.530909+00:00

Affected: PyPI: aiohttp

### 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.

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Patch: https://github.com/aio-libs/aiohttp/commit/53b35a2f8869c37a133e60bf1a82a1c01642ba2b

 https://vulnerability.circl.lu/vuln/pysec-2026-2101 PYSEC-2026-2101 2026-09-28T16:46:41.530967+00:00

Affected: PyPI: aiohttp

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the reason parameter when creating a Response may be able to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.