CVE-2026-42498

Name: CVE-2026-42498
Creator: NVD / NIST
Published: 2026-05-12T16:16:17.8+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.3/10EPSS 0.55%

Last modified Jun 17, 2026

CVE-2026-42498 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. 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.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS Probability

0.55%

41.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Apache	Tomcat	>= 7.0.0, <= 7.0.109
Apache	Tomcat	>= 8.5.0, <= 8.5.100
Apache	Tomcat	>= 9.0.0, < 9.0.118
Apache	Tomcat	>= 10.1.0, < 10.1.55
Apache	Tomcat	>= 11.0.0, < 11.0.22

References

https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdbMailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/12/14Mailing List, Third Party Advisory

Timeline

Published: May 12, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-42498?

How severe is CVE-2026-42498?

CVE-2026-42498 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42498?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42498?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST