CVE-2026-42498

CVSS 7.3 · HIGH

EPSS p42

Lower risk — in the top 58% least-likely-to-be-exploited CVEs.

Patch available

Vendor advisory or patch linked

Published 5/12/2026 · updated 6/17/2026 · CWE-200

Summary

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.

CVSS 7.3 — HIGH

7.3 / 10

AV: Network
AC: Low complexity
PR: No privileges
UI: No user interaction
S: Scope unchanged
C: Confidentiality: Low
I: Integrity: Low
A: Availability: Low

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

EPSS exploitation probability

0.5%

Percentile p42 — Lower risk — in the top 58% least-likely-to-be-exploited CVEs.

Affected products

1 vendor/product entries

Apache Tomcat≥ 7.0.0 and ≤ 7.0.109

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Timeline

May 12, 2026 · Disclosed / published in NVD
Jun 17, 2026 · Intel last updated

Intel sources

Which upstream feeds returned data for this CVE, and when they were last fetched.

NVD· 40 days ago
CVE.org· no data
FIRST EPSS· 40 days ago
CISA KEV· no data
OSV· 40 days ago

References

Vendor & CERT advisories2

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