Inconsistent interpretation of HTTP requests in Apache Tomcat - CVE-2026-24880

Vulnerability identifier: #VU125743

CSH Severity: Medium

CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-24880

CWE-ID: CWE-444

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform request smuggling.

The vulnerability exists due to improper input validation in HTTP/1.1 chunk extension handling when parsing chunked requests. A remote attacker can send a specially crafted request with an invalid chunk extension to perform request smuggling.

Exploitation requires a reverse proxy in front of Tomcat that allows CRLF sequences in an otherwise valid chunk extension.

Apache Tomcat
SUSE Linux Enterprise Server 15 SP6
Debian Linux
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
Web and Scripting Module
openSUSE Leap
openEuler
Anolis OS
Db2 Developer Extension
Storage Defender Copy Data Management
DevOps Deploy
CICS Transaction Gateway Desktop Edition
CICS Transaction Gateway for Multiplatforms
Integration Bus for z/OS
ApplinX
IBM Watson Discovery for IBM Cloud Pak for Data
UCD - IBM UrbanCode Deploy
Confluence Data Center
Bamboo Data Center
IBM Power Hardware Management Console (HMC)
Datastax Enterprise with IBM
IBM Qradar SIEM
tomcat-help
tomcat
tomcat-webapps
tomcat-jsvc
tomcat-admin-webapps
tomcat-doc
tomcat-docs-webapp
tomcat-el-3.0-api
tomcat-jsp-2.3-api
tomcat-lib
tomcat-servlet-4.0-api
tomcat-javadoc
tomcat-servlet-4_0-api
tomcat-jsp-2_3-api
tomcat-el-3_0-api
tomcat10-el-5_0-api
tomcat10-servlet-6_0-api
tomcat10-lib
tomcat10-admin-webapps
tomcat10-jsp-3_1-api
tomcat10
tomcat10-webapps
tomcat10 (Debian package)
tomcat11
tomcat11-docs-webapp
tomcat11-doc
tomcat11-admin-webapps
tomcat11-el-6_0-api
tomcat11-lib
tomcat11-jsvc
tomcat11-embed
tomcat11-webapps
tomcat11-jsp-4_0-api
tomcat11-servlet-6_1-api
tomcat11 (Debian package)

Install security update from vendor's website.

Apache Tomcat - addressed in versions 9.0.116, 10.1.53, 11.0.20
Db2 Developer Extension - update to 1.1.2
Storage Defender Copy Data Management - update to 2.3.0.1
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.2
UCD - IBM UrbanCode Deploy - addressed in versions 7.2.3.24, 7.3.2.19
IBM Qradar SIEM - update to 7.5.0 Update Pack 15 IF05
DevOps Deploy - addressed in versions 8.0.1.14, 8.1.2.7, 8.2.2.0
Confluence Data Center - addressed in versions 9.2.20, 10.2.11
Bamboo Data Center - addressed in versions 9.6.25, 10.2.18, 12.1.6
IBM Power Hardware Management Console (HMC) - addressed in versions 10.3.1064.1, 11.1.1112.0
Datastax Enterprise with IBM - update to 6.9.22
tomcat-help - update to 9.0.117-1
tomcat - update to 9.0.117-1
tomcat-webapps - update to 9.0.117-1
tomcat-jsvc - update to 9.0.117-1
tomcat - update to 9.0.117-1
tomcat-admin-webapps - update to 9.0.117-1
tomcat-doc - update to 9.0.117-1
tomcat-docs-webapp - update to 9.0.117-1
tomcat-el-3.0-api - update to 9.0.117-1
tomcat-jsp-2.3-api - update to 9.0.117-1
tomcat-lib - update to 9.0.117-1
tomcat-servlet-4.0-api - update to 9.0.117-1
tomcat-lib - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-javadoc - update to 9.0.117-3.163.2
tomcat - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-servlet-4_0-api - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-jsp-2_3-api - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-admin-webapps - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-webapps - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-docs-webapp - update to 9.0.117-3.163.2
tomcat-el-3_0-api - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat10-el-5_0-api - update to 10.1.54-150200.5.64.1
tomcat10-servlet-6_0-api - update to 10.1.54-150200.5.64.1
tomcat10-lib - update to 10.1.54-150200.5.64.1
tomcat10-admin-webapps - update to 10.1.54-150200.5.64.1
tomcat10-jsp-3_1-api - update to 10.1.54-150200.5.64.1
tomcat10 - update to 10.1.54-150200.5.64.1
tomcat10-webapps - update to 10.1.54-150200.5.64.1
tomcat10 (Debian package) - addressed in versions 10.1.55-1~deb12u1, 10.1.55-1~deb13u1
tomcat11 - update to 11.0.21-150600.13.18.1
tomcat11-docs-webapp - update to 11.0.21-150600.13.18.1
tomcat11-doc - update to 11.0.21-150600.13.18.1
tomcat11-admin-webapps - update to 11.0.21-150600.13.18.1
tomcat11-el-6_0-api - update to 11.0.21-150600.13.18.1
tomcat11-lib - update to 11.0.21-150600.13.18.1
tomcat11-jsvc - update to 11.0.21-150600.13.18.1
tomcat11-embed - update to 11.0.21-150600.13.18.1
tomcat11-webapps - update to 11.0.21-150600.13.18.1
tomcat11-jsp-4_0-api - update to 11.0.21-150600.13.18.1
tomcat11-servlet-6_1-api - update to 11.0.21-150600.13.18.1
tomcat11 (Debian package) - update to 11.0.22-1~deb13u1

• https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.20
• https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.53
• https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.116
• https://lists.apache.org/thread/sq4jfs2c53fn6x6lvsdd4w5rfdhjvnhx

• Multiple vulnerabilities in Apache Tomcat (March 2026 release)
• openEuler update for tomcat
• Anolis OS update for tomcat
• Bamboo Data Center update for tomcat-catalina
• SUSE update for tomcat11
• SUSE update for tomcat
• SUSE update for tomcat10
• SUSE update for tomcat
• Multiple vulnerabilities in IBM Storage Defender Copy Data Management
• Multiple vulnerabilities in IBM Watson Discovery Cartridge
• Multiple vulnerabilities in IBM Integration Bus for z/OS
• Multiple vulnerabilities in IBM DataStax Enterprise
• Multiple vulnerabilities in Confluence Data Center
• Debian update for tomcat11
• Debian update for tomcat10
• Multiple vulnerabilities in IBM ApplinX
• IBM DevOps Deploy / UrbanCode Deploy (UCD) update for Apache Tomcat
• Multiple vulnerabilities in IBM Power Hardware Management Console (HMC)
• Multiple vulnerabilities in IBM CICS Transaction Gateway for Multiplatforms
• Multiple vulnerabilities in CICS Transaction Gateway Desktop Edition
• Multiple vulnerabilities in IBM QRadar SIEM
• Multiple vulnerabilities in IBM Db2 Developer Extension