Vulnerability · Published Jun 29, 2026 · Assigned by apache
CVE-2026-55276Apache Tomcat: Logged effective web.xml is incomplete
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 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty authorisation constraints were not included when the effective web.xml was logged. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119 which fixes the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| 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: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: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: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: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: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 | no fix listed | DEBIAN-CVE-2026-55276 |
| Debian:13 | tomcat10 | no fix listed | DEBIAN-CVE-2026-55276 |
| Debian:14 | tomcat10 | 10.1.60-1 | DEBIAN-CVE-2026-55276 |
| Debian:13 | tomcat11 | no fix listed | DEBIAN-CVE-2026-55276 |
| Debian:14 | tomcat11 | 11.0.24-1 | DEBIAN-CVE-2026-55276 |
| Debian:12 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-55276 |
| Debian:13 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-55276 |
| Debian:14 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-55276 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 10.1.56 | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 9.0.119 | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | no fix listed | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 11.0.23 | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat:tomcat | 11.0.23 | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat:tomcat | 9.0.119 | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat:tomcat | no fix listed | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat:tomcat | 10.1.56 | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat:tomcat-util-scan | 11.0.23 | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat:tomcat-util-scan | no fix listed | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat:tomcat-util-scan | 9.0.119 | GHSA-mqg3-r7h5-24x4 |
| Maven | org.apache.tomcat:tomcat-util-scan | 10.1.56 | GHSA-mqg3-r7h5-24x4 |
| Ubuntu:24.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-55276 |
| Ubuntu:25.10 | tomcat10 | no fix listed | UBUNTU-CVE-2026-55276 |
| Ubuntu:26.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-55276 |
| Ubuntu:26.10 | tomcat10 | no fix listed | UBUNTU-CVE-2026-55276 |
| Ubuntu:25.10 | tomcat11 | no fix listed | UBUNTU-CVE-2026-55276 |
| Ubuntu:26.04:LTS | tomcat11 | no fix listed | UBUNTU-CVE-2026-55276 |
| Ubuntu:26.10 | tomcat11 | no fix listed | UBUNTU-CVE-2026-55276 |
| Ubuntu:24.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-55276 |
| Ubuntu:25.10 | tomcat9 | no fix listed | UBUNTU-CVE-2026-55276 |
| Ubuntu:26.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-55276 |
| Ubuntu:26.10 | tomcat9 | no fix listed | UBUNTU-CVE-2026-55276 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – through 11.0.2210.1.0-M1 – through 10.1.559.0.0.M1 – through 9.0.1188.5.0 – through 8.5.100 |
Weakness: CWE-670 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N