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.
History

Thu, 14 May 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Wed, 13 May 2026 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Emmett-framework
Emmett-framework granian
Vendors & Products Emmett-framework
Emmett-framework granian

Tue, 12 May 2026 22:15:00 +0000

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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-14T12:35:27.130Z

Reserved: 2026-04-28T16:56:50.191Z

Link: CVE-2026-42545

cve-icon Vulnrichment

Updated: 2026-05-14T12:35:09.326Z

cve-icon NVD

Status : Deferred

Published: 2026-05-12T22:16:34.600

Modified: 2026-05-14T13:16:18.370

Link: CVE-2026-42545

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-13T10:35:20Z