[SECURITY] CVE-2026-24880 Apache Tomcat - Request smuggling via invalid chunk extension
Mark Thomas <[email protected]> Thu, 9 Apr 2026 20:03:14 +0100
| Newsgroups | gmane.comp.apache.maven.announce,gmane.comp.apache.incubator.bigtop.devel,gmane.comp.jakarta.tomcat.user |
|---|---|
| Message-ID | <56cd32df-f312-4efc-80ee-1250c9fdf988__35842.2310951696$1775761436$gmane$org@apache.org> |
CVE-2026-24880 Apache Tomcat - Request smuggling via invalid chunk extension Severity: Low Vendor: The Apache Software Foundation Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.18 Apache Tomcat 10.1.0-M1 to 10.1.52 Apache Tomcat 9.0.0.M1 to 9.0.115 Older, EOS versions may also be affected Description: Tomcat did not validate that contents of HTTP/1.1 chunk extensions. This enabled a request smuggling attack if a reverse proxy in front of Tomcat allowed CRLF sequences in an otherwise valid chunk extension. Mitigation: Users of the affected versions should apply one of the following mitigations: - Upgrade to Apache Tomcat 11.0.20 or later - Upgrade to Apache Tomcat 10.1.53 or later - Upgrade to Apache Tomcat 9.0.116 or later Credit: This issue was identified by Xclow3n History: 2026-04-09 Original advisory References: [1] https://tomcat.apache.org/security-11.html [2] https://tomcat.apache.org/security-10.html [3] https://tomcat.apache.org/security-9.html