What is CVE-2026-42545?

CVE-2026-42545 is a medium-severity vulnerability in Emmett-framework Granian, classified under CWE-248. CVSS score: 5.9/10. Published 2026-05-12.

How severe is CVE-2026-42545?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Emmett-framework Granian

CVE-2026-42545

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 bo…

EPSS: 0.001 (16.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Emmett-framework Granian — versions >= 0.2.0, < 2.7.4

Weakness classification (CWE)

CWE-248
CWE-755 — Improper Handling of Exceptional Conditions

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-42545?: CVE-2026-42545 is a medium-severity vulnerability in Emmett-framework Granian, classified under CWE-248. CVSS score: 5.9/10. Published 2026-05-12.
How severe is CVE-2026-42545?: Medium severity. CVSS v3 base score is 5.9 out of 10.