apache/tomcat · Security
Apache Tomcat - WebSocket authentication header exposure
- GHSA ID
- GHSA-fv25-8xcx-gqjc
- CVE ID
- CVE-2026-42498
- Severity
- high
- Published
- Updated
- CVSS
- 7.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- CVSS v3
- 7.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Description
Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.2 to 9.0.117 Older, unsupported versions may also be affected
Description: If a WebSocket request was redirected after authentication, Tomcat's WebSocket client would present the most recent authentication header to the redirect target host.
Mitigation: Users of the affected versions should apply one of the following mitigations:
- Upgrade to Apache Tomcat 11.0.22 or later
- Upgrade to Apache Tomcat 10.1.55 or later
- Upgrade to Apache Tomcat 9.0.118 or later
Credit: This issue was identified by lokerxx
CWEs
- CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-42498 ↗
- https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb ↗
- http://www.openwall.com/lists/oss-security/2026/05/12/14 ↗
- https://github.com/apache/tomcat/commit/169d725788ea6aec217ecac70fe4161c837ba423 ↗
- https://github.com/apache/tomcat/commit/6cbe274592ef2d11607b5b188e1df649de52f8d5 ↗
- https://github.com/apache/tomcat/commit/b7b173694d588ddcfa432f079baf763cbbbaa5c4 ↗
- https://tomcat.apache.org/security-10.html ↗
- https://tomcat.apache.org/security-11.html ↗
- https://tomcat.apache.org/security-9.html ↗
- https://github.com/advisories/GHSA-fv25-8xcx-gqjc ↗