GitHub Advisoryadvisory · Maven
GHSA-fv25-8xcx-gqjc Apache Tomcat - WebSocket authentication header exposure
HIGH
Official page ↗
- Aliases
- CVE-2026-42498
- Ecosystem
- Maven
- Packages
- org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat:tomcat, org.apache.tomcat:tomcat-catalina
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Weaknesses
- CWE-200
- Reviewed
- 2026-05-18
Affected packages
• Maven org.apache.tomcat.embed:tomcat-embed-core: < 9.0.118 → fixed in 9.0.118
• Maven org.apache.tomcat.embed:tomcat-embed-core: >= 10.1.0-M1, < 10.1.55 → fixed in 10.1.55
• Maven org.apache.tomcat.embed:tomcat-embed-core: >= 11.0.0-M1, < 11.0.22 → fixed in 11.0.22
• Maven org.apache.tomcat:tomcat: < 9.0.118 → fixed in 9.0.118
• Maven org.apache.tomcat:tomcat: >= 10.1.0-M1, < 10.1.55 → fixed in 10.1.55
• Maven org.apache.tomcat:tomcat: >= 11.0.0-M1, < 11.0.22 → fixed in 11.0.22
• Maven org.apache.tomcat:tomcat-catalina: < 9.0.118 → fixed in 9.0.118
• Maven org.apache.tomcat:tomcat-catalina: >= 10.1.0-M1, < 10.1.55 → fixed in 10.1.55
• Maven org.apache.tomcat:tomcat-catalina: >= 11.0.0-M1, < 11.0.22 → fixed in 11.0.22
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
Related
Alias · CVE (1)
- CVE-2026-42498 Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat. vulnerability
Weakness · CWE (1)
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-42498 advisory
- https://github.com/apache/tomcat/commit/169d725788ea6aec217ecac70fe4161c837ba423 web
- https://github.com/apache/tomcat/commit/6cbe274592ef2d11607b5b188e1df649de52f8d5 web
- https://github.com/apache/tomcat/commit/b7b173694d588ddcfa432f079baf763cbbbaa5c4 web
- https://github.com/apache/tomcat package
- https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb web
- https://tomcat.apache.org/security-10.html web
- https://tomcat.apache.org/security-11.html web
- https://tomcat.apache.org/security-9.html web
- http://www.openwall.com/lists/oss-security/2026/05/12/14 web