CVE-2026-42545

Granian: DoS via WSGI response header panic

State: Published
Severity: 5.9 Medium
Published: May 12, 2026
Updated: May 14, 2026
Reserved: Apr 28, 2026

Description

Granian is a Rust HTTP server for Python applications. From 0.2.0 to 2.7.4, Granian aborts a worker process if a WSGI application returns an invalid HTTP response header name or value. The WSGI response conversion path uses .unwrap() on both the header name and header value constructors, so malformed output from the application becomes a process abort instead of a handled error. This vulnerability is fixed in 2.7.4.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-248 Uncaught Exception
CWE-755 Improper Handling of Exceptional Conditions

Affected Products

Product	Versions
granianemmett-framework	>= 0.2.0, < 2.7.4Affected

References

https://github.com/emmett-framework/granian/security/advisories/GHSA-f5p7-9fr5-8jmj

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