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OpenAdvisories
Medium · 5.9 CVE-2026-42545 EUVD-2026-29856GHSA-f5p7-9fr5-8jmjPYSEC-2026-2502

Granian: DoS via WSGI response header panic

Published May 12, 2026 · Updated May 14, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
emmett-framework granian >= 0.2.0, < 2.7.4 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling reflex 0.9.3-r0 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI granian >= 0.2.0, < 2.7.4 2.7.4 GHSA-f5p7-9fr5-8jmj

References