Is aiohttp affected by CVE-2026-34514?

PyPI aiohttp is affected in <3.13.4.

Is CVE-2026-34514 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

low

CVE-2026-34514

Q: Is CVE-2026-34514 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

PyPI · aiohttp

Summary

AIOHTTP has CRLF injection through multipart part content type header construction

Severity: low
EPSS: 0.3% (p23)
Also known as: GHSA-2vrm-gr82-f7m5
Published: 2026-04-01

References

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

Related advisories

CVE-2025-69223 — high · PyPI/aiohttp
CVE-2026-54274 — medium · PyPI/aiohttp
CVE-2026-54273 — medium · PyPI/aiohttp
CVE-2026-54278 — medium · PyPI/aiohttp
CVE-2026-54277 — medium · PyPI/aiohttp
CVE-2026-54276 — medium · PyPI/aiohttp
CVE-2026-47265 — medium · PyPI/aiohttp
CVE-2026-34993 — medium · PyPI/aiohttp

Is your project exposed to this? Stateward checks every dependency on every pull request and flags it only if your code actually reaches it.

Check my repo

Summarize with AI

ChatGPT Claude Perplexity

Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.