CVE-2026-42498

Apache Tomcat: WebSocket authentication header exposure

At a glance

Severity: HIGH 7.3
EPSS: EPSS 0.65 % · percentile 51 (2026-10-27)
State: PUBLISHED
Published: 2026-05-12
Updated: 2026-05-13
Assigner: apache
NVD status: Analyzed

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L	CISA-ADP
CVSS 3.1	HIGH 7.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Weaknesses (CWE)

CWE-200

Advisories

GHSA-fv25-8xcx-gqjc — Apache Tomcat - WebSocket authentication header exposure

European references

ENISA EUVD · EUVD-2026-29515
GCVE · GCVE-0-2026-42498

CERT-FR advisories

CERTFR-2026-AVI-1165 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2026-AVI-0986 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2026-AVI-0773 — Multiples vulnérabilités dans les produits Atlassian · cert.ssi.gouv.fr
CERTFR-2026-AVI-0577 — Multiples vulnérabilités dans Apache Tomcat · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 7.0.0 ≤ 7.0.109
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 8.5.0 ≤ 8.5.100
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 9.0.0 < 9.0.118
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 10.1.0 < 10.1.55
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 11.0.0 < 11.0.22

Affected products

Product	Versions
Apache Software Foundation · Apache Tomcat	affected 11.0.0-M1 ≤ 11.0.21 ; affected 10.1.0-M1 ≤ 10.1.54 ; affected 9.0.2 ≤ 9.0.117 ; affected 8.5.24 ≤ 8.5.100 ; affected 7.0.83 ≤ 7.0.109

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD