Vulnerability · Published May 12, 2026 · Assigned by apache
CVE-2026-43515Apache Tomcat: Security constraints not correctly applied
Critical 9.1
In plain English
A critical-severity security flaw in Apache Tomcat from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)1.2%top 31.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension 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 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | tomcat | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat-admin-webapps | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat-admin-webapps | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-admin-webapps | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat-docs-webapp | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat-docs-webapp | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-docs-webapp | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:8 | tomcat-el-3.0-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-el-3.0-api | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat-el-5.0-api | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat-jsp-2.3-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-jsp-2.3-api | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat-jsp-3.1-api | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:10 | tomcat-lib | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat-lib | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-lib | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:8 | tomcat-servlet-4.0-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-servlet-4.0-api | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat-servlet-6.0-api | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:10 | tomcat-webapps | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat-webapps | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-webapps | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat9 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-admin-webapps | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-docs-webapp | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-el-3.0-api | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-jsp-2.3-api | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-lib | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-servlet-4.0-api | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-webapps | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| Debian:12 | tomcat10 | 10.1.55-1~deb12u1 | DEBIAN-CVE-2026-43515 |
| Debian:13 | tomcat10 | 10.1.55-1~deb13u1 | DEBIAN-CVE-2026-43515 |
| Debian:14 | tomcat10 | 10.1.55-1 | DEBIAN-CVE-2026-43515 |
| Debian:13 | tomcat11 | 11.0.22-1~deb13u1 | DEBIAN-CVE-2026-43515 |
| Debian:14 | tomcat11 | 11.0.22-1 | DEBIAN-CVE-2026-43515 |
| Debian:12 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-43515 |
| Debian:13 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-43515 |
| Debian:14 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-43515 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 10.1.55 | GHSA-5m62-pw8w-7w9f |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 11.0.22 | GHSA-5m62-pw8w-7w9f |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 9.0.118 | GHSA-5m62-pw8w-7w9f |
| Maven | org.apache.tomcat:tomcat | 11.0.22 | GHSA-5m62-pw8w-7w9f |
| Maven | org.apache.tomcat:tomcat | 9.0.118 | GHSA-5m62-pw8w-7w9f |
| Maven | org.apache.tomcat:tomcat | 10.1.55 | GHSA-5m62-pw8w-7w9f |
| Maven | org.apache.tomcat:tomcat-catalina | 11.0.22 | GHSA-5m62-pw8w-7w9f |
| Maven | org.apache.tomcat:tomcat-catalina | 10.1.55 | GHSA-5m62-pw8w-7w9f |
| Maven | org.apache.tomcat:tomcat-catalina | 9.0.118 | GHSA-5m62-pw8w-7w9f |
| Rocky Linux:10 | tomcat | 1:10.1.49-4.el10_2 | RLSA-2026:69259 |
| Rocky Linux:8 | tomcat | 1:9.0.120-1.el8_10 | RLSA-2026:68677 |
| Rocky Linux:9 | tomcat | 1:9.0.120-2.el9_8 | RLSA-2026:68660 |
| Rocky Linux:10 | tomcat9 | 1:9.0.120-1.el10_2 | RLSA-2026:68651 |
| Ubuntu:25.10 | tomcat10 | 10.1.40-1ubuntu1.25.10.1 | UBUNTU-CVE-2026-43515 |
| Ubuntu:26.04:LTS | tomcat10 | 10.1.40-1ubuntu1.26.04.1 | UBUNTU-CVE-2026-43515 |
| Ubuntu:25.10 | tomcat11 | no fix listed | UBUNTU-CVE-2026-43515 |
| Ubuntu:25.10 | tomcat9 | 9.0.95-1ubuntu1.1 | UBUNTU-CVE-2026-43515 |
| Ubuntu:26.04:LTS | tomcat9 | 9.0.115-1ubuntu0.1 | UBUNTU-CVE-2026-43515 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – through 11.0.2110.1.0-M1 – through 10.1.549.0.0.M1 – through 9.0.1178.5.0 – through 8.5.1007.0.0 – through 7.0.109 |
Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N