CVE-2026-42545

Granian: DoS via WSGI response header panic

Published May 12, 2026 CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-f5p7-9fr5-8jmj Granian vulnerable to DoS via WSGI response header panic
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Emmett-framework
Emmett-framework granian
Vendors & Products Emmett-framework
Emmett-framework granian
Type Values Removed Values Added
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.
Title Granian: DoS via WSGI response header panic
Weaknesses CWE-248
CWE-755
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 14, 2026, 12:35 PM
Reserved
Apr 28, 2026, 4:56 PM
Status
Deferred
Published
May 12, 2026, 10:16 PM
Modified
Oct 26, 2026, 2:10 PM