CVE-2026-42545: Emmett-Framework Granian

Medium severity, CVSS 5.9. EPSS: 0.4% chance of exploitation in the next 30 days.

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

• Emmett-Framework Granian: from 0.2.0, before 2.7.4 (fixed in 2.7.4)

Published 2026-05-12. Last modified 2026-06-17.