Is CVE-2026-42544 actively exploited?

No active exploitation of CVE-2026-42544 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42544 be exploited remotely?

Yes. CVE-2026-42544 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42544?

CVE-2026-42544 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-42544

HIGH

CVE-2026-42544

CWE-20Published: May 12, 2026· Updated: May 18, 2026

7.5

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:18.5th

Official Description

Granian is a Rust HTTP server for Python applications. From 1.2.0 to 2.7.4, Granian aborts a worker process when an unauthenticated client sends a WebSocket upgrade request whose Sec-WebSocket-Protocol header contains non-ASCII bytes. The crash happens in Granian's WebSocket scope construction path, before the ASGI application is invoked. This vulnerability is fixed in 2.7.4.

NVD Source

Technical Analysis

CVE-2026-42544 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 7.5.