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CVE-2026-42498

CVE-2026-42498 · Apache Tomcat: WebSocket authentication header exposure

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 · EPSS 0.6% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • apache tomcat

    Versions
    • ≥ 11.0.0-M1, ≤ 11.0.21: Affected (semver)
    • ≥ 10.1.0-M1, ≤ 10.1.54: Affected (semver)
    • ≥ 9.0.2, ≤ 9.0.117: Affected (semver)
    • ≥ 8.5.24, ≤ 8.5.100: Affected (semver)
    • ≥ 7.0.83, ≤ 7.0.109: Affected (semver)

    No fix published

  • tomcat10 Debian:12

    Versions
    • 10.1.10-1
    • 10.1.13-1
    • 10.1.14-1
    • 10.1.15-1
    • 10.1.16-1
    • 10.1.20-1
    • 10.1.23-1
    • 10.1.25-1
    • 10.1.25-1~bpo12+1
    • 10.1.25-2
    • 10.1.30-1
    • 10.1.30-1~bpo12+1
    • 10.1.31-1
    • 10.1.33-1
    • 10.1.33-1~bpo12+1
    • 10.1.34-0+deb12u1
    • 10.1.34-0+deb12u2
    • 10.1.34-1
    • 10.1.35-1
    • 10.1.40-1
    • 10.1.40-1~bpo12+1
    • 10.1.46-1
    • 10.1.52-1
    • 10.1.52-1~deb12u1
    • 10.1.52-1~deb13u1
    • 10.1.52-2
    • 10.1.54-1
    • 10.1.6-1
    • 10.1.6-1+deb12u1
    • 10.1.6-1+deb12u2
    • 10.1.7-1
    • 10.1.8-1
    • 10.1.9-1
    Affected ranges
    • ECOSYSTEM: < 10.1.55-1~deb12u1

    Update to 10.1.55-1~deb12u1

  • tomcat10 Debian:13

    Versions
    • 10.1.40-1
    • 10.1.46-1
    • 10.1.52-1
    • 10.1.52-1~deb12u1
    • 10.1.52-1~deb13u1
    • 10.1.52-2
    • 10.1.54-1
    • 10.1.55-1~deb12u1
    Affected ranges
    • ECOSYSTEM: < 10.1.55-1~deb13u1

    Update to 10.1.55-1~deb13u1

  • tomcat10 Debian:14

    Versions
    • 10.1.40-1
    • 10.1.46-1
    • 10.1.52-1
    • 10.1.52-1~deb12u1
    • 10.1.52-1~deb13u1
    • 10.1.52-2
    • 10.1.54-1
    • 10.1.55-1~deb12u1
    • 10.1.55-1~deb13u1
    Affected ranges
    • ECOSYSTEM: < 10.1.55-1

    Update to 10.1.55-1

  • tomcat11 Debian:13

    Versions
    • 11.0.11-1
    • 11.0.15-1
    • 11.0.15-1~deb13u1
    • 11.0.18-1
    • 11.0.21-1
    • 11.0.6-1
    Affected ranges
    • ECOSYSTEM: < 11.0.22-1~deb13u1

    Update to 11.0.22-1~deb13u1

  • tomcat11 Debian:14

    Versions
    • 11.0.11-1
    • 11.0.15-1
    • 11.0.15-1~deb13u1
    • 11.0.18-1
    • 11.0.21-1
    • 11.0.22-1~deb13u1
    • 11.0.6-1
    Affected ranges
    • ECOSYSTEM: < 11.0.22-1

    Update to 11.0.22-1

  • tomcat9 Debian:12

    Affected ranges
    • ECOSYSTEM: < 9.0.70-2

    Update to 9.0.70-2

  • tomcat9 Debian:13

    Affected ranges
    • ECOSYSTEM: < 9.0.70-2

    Update to 9.0.70-2

  • tomcat9 Debian:14

    Affected ranges
    • ECOSYSTEM: < 9.0.70-2

    Update to 9.0.70-2

  • tomcat9 Ubuntu:Pro:18.04:LTS

    Versions
    • 9.0.16-3~18.04.1
    • 9.0.16-3ubuntu0.18.04.1
    • 9.0.16-3ubuntu0.18.04.2
    • 9.0.16-3ubuntu0.18.04.2+esm1
    • 9.0.16-3ubuntu0.18.04.2+esm2
    • 9.0.16-3ubuntu0.18.04.2+esm3
    • 9.0.16-3ubuntu0.18.04.2+esm4
    • 9.0.16-3ubuntu0.18.04.2+esm5
    • 9.0.16-3ubuntu0.18.04.2+esm6
    • 9.0.16-3ubuntu0.18.04.2+esm7
    Affected ranges
    • ECOSYSTEM: < 9.0.16-3ubuntu0.18.04.2+esm8

    Update to 9.0.16-3ubuntu0.18.04.2+esm8

  • tomcat9 Ubuntu:Pro:20.04:LTS

    Versions
    • 9.0.24-1
    • 9.0.27-1
    • 9.0.31-1
    • 9.0.31-1ubuntu0.1
    • 9.0.31-1ubuntu0.2
    • 9.0.31-1ubuntu0.3
    • 9.0.31-1ubuntu0.4
    • 9.0.31-1ubuntu0.5
    • 9.0.31-1ubuntu0.6
    • 9.0.31-1ubuntu0.7
    • 9.0.31-1ubuntu0.8
    • 9.0.31-1ubuntu0.9
    • 9.0.31-1ubuntu0.9+esm1
    • 9.0.31-1ubuntu0.9+esm2
    Affected ranges
    • ECOSYSTEM: < 9.0.31-1ubuntu0.9+esm3

    Update to 9.0.31-1ubuntu0.9+esm3

  • tomcat9 Ubuntu:Pro:22.04:LTS

    Versions
    • 9.0.43-3
    • 9.0.54-1
    • 9.0.55-1
    • 9.0.58-1
    • 9.0.58-1ubuntu0.1
    • 9.0.58-1ubuntu0.1+esm1
    • 9.0.58-1ubuntu0.1+esm2
    • 9.0.58-1ubuntu0.1+esm3
    • 9.0.58-1ubuntu0.1+esm4
    • 9.0.58-1ubuntu0.2
    • 9.0.58-1ubuntu0.2+esm1
    • 9.0.58-1ubuntu0.2+esm2
    • 9.0.58-1ubuntu0.2+esm3
    Affected ranges
    • ECOSYSTEM: < 9.0.58-1ubuntu0.2+esm4

    Update to 9.0.58-1ubuntu0.2+esm4

  • tomcat10 Ubuntu:Pro:24.04:LTS

    Versions
    • 10.1.10-1
    • 10.1.14-1
    • 10.1.15-1
    • 10.1.16-1
    • 10.1.16-1ubuntu0.1~esm1
    • 10.1.16-1ubuntu0.1~esm2
    • 10.1.16-1ubuntu0.1~esm3
    Affected ranges
    • ECOSYSTEM: < 10.1.16-1ubuntu0.1~esm4

    Update to 10.1.16-1ubuntu0.1~esm4

  • tomcat9 Ubuntu:Pro:24.04:LTS

    Versions
    • 9.0.70-1ubuntu1
    • 9.0.70-2
    • 9.0.70-2ubuntu0.1
    • 9.0.70-2ubuntu0.1+esm1
    • 9.0.70-2ubuntu0.1+esm2
    Affected ranges
    • ECOSYSTEM: < 9.0.70-2ubuntu0.1+esm3

    Update to 9.0.70-2ubuntu0.1+esm3

  • tomcat10 Ubuntu:25.10

    Versions
    • 10.1.35-1
    • 10.1.40-1
    • 10.1.40-1ubuntu1
    Affected ranges
    • ECOSYSTEM: < 10.1.40-1ubuntu1.25.10.1

    Update to 10.1.40-1ubuntu1.25.10.1

  • tomcat11 Ubuntu:25.10

    Versions
    • 11.0.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • tomcat9 Ubuntu:25.10

    Versions
    • 9.0.70-2ubuntu1.1
    • 9.0.70-2ubuntu2
    • 9.0.70-2ubuntu3
    • 9.0.95-1ubuntu1
    Affected ranges
    • ECOSYSTEM: < 9.0.95-1ubuntu1.1

    Update to 9.0.95-1ubuntu1.1

  • tomcat10 Ubuntu:26.04:LTS

    Versions
    • 10.1.40-1ubuntu1
    Affected ranges
    • ECOSYSTEM: < 10.1.40-1ubuntu1.26.04.1

    Update to 10.1.40-1ubuntu1.26.04.1

  • tomcat9 Ubuntu:26.04:LTS

    Versions
    • 9.0.95-1ubuntu1
    • 9.0.111-1
    • 9.0.115-1
    Affected ranges
    • ECOSYSTEM: < 9.0.115-1ubuntu0.1

    Update to 9.0.115-1ubuntu0.1

  • tomcat11 Ubuntu:Pro:26.04:LTS

    Versions
    • 11.0.6-1
    • 11.0.11-1
    • 11.0.15-1
    • 11.0.18-1
    Affected ranges
    • ECOSYSTEM: < 11.0.18-1ubuntu0.1~esm1

    Update to 11.0.18-1ubuntu0.1~esm1

Original sources

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