High severity7.5GHSA Advisory· Published May 12, 2026· Updated May 13, 2026

CVE-2026-42544

Description

Granian is a Rust HTTP server for Python applications. From 1.2.0 to 2.7.4, Granian aborts a worker process when an unauthenticated client sends a WebSocket upgrade request whose Sec-WebSocket-Protocol header contains non-ASCII bytes. The crash happens in Granian's WebSocket scope construction path, before the ASGI application is invoked. This vulnerability is fixed in 2.7.4.

Affected products

Emmett Framework/GranianGHSA
Range: >= 1.2.0, < 2.7.4

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

github.com/advisories/GHSA-vrg7-482j-p6f6ghsaADVISORY
github.com/emmett-framework/granian/security/advisories/GHSA-vrg7-482j-p6f6nvd
nvd.nist.gov/vuln/detail/CVE-2026-42544ghsa

News mentions

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