High severity7.5GHSA Advisory· Published May 12, 2026· Updated May 18, 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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
granianPyPI	>= 1.2.0, < 2.7.4	2.7.4

Affected products

Emmett Framework/GranianGHSA
Range: >= 1.2.0, < 2.7.4
osv-coords4 versions
pkg:apk/chainguard/litellm pkg:apk/chainguard/reflex pkg:apk/wolfi/reflex pkg:pypi/granian
< 1.87.0-r1+ 3 more
- (no CPE)range: < 1.87.0-r1
- (no CPE)range: < 0.9.3-r0
- (no CPE)range: < 0.9.3-r0
- (no CPE)range: >= 1.2.0, < 2.7.4

Patches

Vulnerability mechanics

References

github.com/advisories/GHSA-vrg7-482j-p6f6ghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2026-42544ghsaADVISORY
github.com/emmett-framework/granian/security/advisories/GHSA-vrg7-482j-p6f6nvdWEB

News mentions

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000