CVE-2026-42498 PUBLISHED

Apache Tomcat: WebSocket authentication header exposure

Assigner: apache
Reserved: 27.04.2026 Published: 12.05.2026 Updated: 12.05.2026

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.

Product Status

Vendor Apache Software Foundation
Product Apache Tomcat
Versions Default: unaffected
  • affected from 11.0.0-M1 to 11.0.21 (incl.)
  • affected from 10.1.0-M1 to 10.1.54 (incl.)
  • affected from 9.0.2 to 9.0.117 (incl.)
  • affected from 8.5.24 to 8.5.100 (incl.)
  • affected from 7.0.83 to 7.0.109 (incl.)

Credits

  • lokerxx finder

References

Problem Types

  • CWE-200 Exposure of HTTP Authentication Header to unexpected hosts CWE