Is CVE-2026-42545 actively exploited?

No active exploitation of CVE-2026-42545 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42545 be exploited remotely?

Yes. CVE-2026-42545 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42545?

CVE-2026-42545 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2026-42545

CWE-248Published: May 12, 2026· Updated: May 14, 2026

5.9

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42545 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.9.