~ / search / GHSA-mq44-7p77-q5h7

GHSA-mq44-7p77-q5h7

AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-59881

Packages

EcosystemPackageAffectedFixed in
PyPI aiohttp < 3.14.2 3.14.2

Details

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

### Summary The client accepts and decompresses frames with the RSV1 bit set even when the `permessage-deflate` extension was not negotiated. ### Impact A client may unexpectedly decompress WebSocket frames when explicitly opted out. This could lead to additional CPU/memory consumption, but is unlikely to be a significant issue unless a zip bomb vulnerability or similar is also present. --- Patch: https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6

References

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