GHSA-m5qp-6w8w-w647 (CVE-2026-34516)

Details

Summary

A response with an excessive number of multipart headers may be allowed to use more memory than intended, potentially allowing a DoS vulnerability.

Impact

Multipart headers were not subject to the same size restrictions in place for normal headers, potentially allowing substantially more data to be loaded into memory than intended. However, other restrictions in place limit the impact of this vulnerability.

Patch: https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f

Affected Packages

aiohttp

PyPI

Fixed in:

3.13.4

References

ADVISORY

https://github.com/advisories/GHSA-m5qp-6w8w-w647

PACKAGE

https://github.com/aio-libs/aiohttp

WEB

https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f

WEB

https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4

WEB

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647

ADVISORY

https://nvd.nist.gov/vuln/detail/CVE-2026-34516