Is CVE-2026-42498 actively exploited?

No active exploitation of CVE-2026-42498 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42498 be exploited remotely?

Yes. CVE-2026-42498 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42498?

CVE-2026-42498 has a CVSS score of 7.3 (HIGH).

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HIGH

CVE-2026-42498

CWE-200Published: May 12, 2026· Updated: May 14, 2026

7.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.1th

Official Description

Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, from 7.0.83 through 7.0.109.

Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118, which fix the issue.

NVD Source

Technical Analysis

CVE-2026-42498 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.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.