Is CVE-2026-43513 actively exploited?

No active exploitation of CVE-2026-43513 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-43513 be exploited remotely?

Yes. CVE-2026-43513 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-43513?

CVE-2026-43513 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-43513

CWE-178Published: May 12, 2026· Updated: May 15, 2026

7.5

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:5.1th

Official Description

Improper Handling of Case Sensitivity vulnerability in LockOutRealm 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 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.

Older unsupported versions may also be affected.

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-2026-43513 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 complete confidentiality breach (data exposure), with a CVSS base score of 7.5.