Vulnerability · Published Apr 9, 2026 · Assigned by apache
CVE-2026-29146Apache Tomcat: EncryptInterceptor vulnerable to padding oracle attack by default
High 7.5
In plain English
A high-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 8.8% (higher than 95% 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)7.5High
Exploit odds (30 days)8.8%top 4.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.0.0-M1 through 10.1.52, from 9.0.13 through 9..115, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.19, 10.1.53 and 9.0.116, which fixes the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | tomcat | 1:10.1.49-3.el10_2.alma.1 | ALSA-2026:36788 |
| AlmaLinux:8 | tomcat | 1:9.0.87-2.el8_10 | ALSA-2026:37137 |
| AlmaLinux:9 | tomcat | 1:9.0.117-2.el9_8 | ALSA-2026:36879 |
| AlmaLinux:10 | tomcat-admin-webapps | 1:10.1.49-3.el10_2.alma.1 | ALSA-2026:36788 |
| AlmaLinux:8 | tomcat-admin-webapps | 1:9.0.87-2.el8_10 | ALSA-2026:37137 |
| AlmaLinux:9 | tomcat-admin-webapps | 1:9.0.117-2.el9_8 | ALSA-2026:36879 |
| AlmaLinux:10 | tomcat-docs-webapp | 1:10.1.49-3.el10_2.alma.1 | ALSA-2026:36788 |
| AlmaLinux:8 | tomcat-docs-webapp | 1:9.0.87-2.el8_10 | ALSA-2026:37137 |
| AlmaLinux:9 | tomcat-docs-webapp | 1:9.0.117-2.el9_8 | ALSA-2026:36879 |
| AlmaLinux:8 | tomcat-el-3.0-api | 1:9.0.87-2.el8_10 | ALSA-2026:37137 |
| AlmaLinux:9 | tomcat-el-3.0-api | 1:9.0.117-2.el9_8 | ALSA-2026:36879 |
| AlmaLinux:10 | tomcat-el-5.0-api | 1:10.1.49-3.el10_2.alma.1 | ALSA-2026:36788 |
| AlmaLinux:8 | tomcat-jsp-2.3-api | 1:9.0.87-2.el8_10 | ALSA-2026:37137 |
| AlmaLinux:9 | tomcat-jsp-2.3-api | 1:9.0.117-2.el9_8 | ALSA-2026:36879 |
| AlmaLinux:10 | tomcat-jsp-3.1-api | 1:10.1.49-3.el10_2.alma.1 | ALSA-2026:36788 |
| AlmaLinux:10 | tomcat-lib | 1:10.1.49-3.el10_2.alma.1 | ALSA-2026:36788 |
| AlmaLinux:8 | tomcat-lib | 1:9.0.87-2.el8_10 | ALSA-2026:37137 |
| AlmaLinux:9 | tomcat-lib | 1:9.0.117-2.el9_8 | ALSA-2026:36879 |
| AlmaLinux:8 | tomcat-servlet-4.0-api | 1:9.0.87-2.el8_10 | ALSA-2026:37137 |
| AlmaLinux:9 | tomcat-servlet-4.0-api | 1:9.0.117-2.el9_8 | ALSA-2026:36879 |
| AlmaLinux:10 | tomcat-servlet-6.0-api | 1:10.1.49-3.el10_2.alma.1 | ALSA-2026:36788 |
| AlmaLinux:10 | tomcat-webapps | 1:10.1.49-3.el10_2.alma.1 | ALSA-2026:36788 |
| AlmaLinux:8 | tomcat-webapps | 1:9.0.87-2.el8_10 | ALSA-2026:37137 |
| AlmaLinux:9 | tomcat-webapps | 1:9.0.117-2.el9_8 | ALSA-2026:36879 |
| AlmaLinux:10 | tomcat9 | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-admin-webapps | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-docs-webapp | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-el-3.0-api | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-jsp-2.3-api | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-lib | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-servlet-4.0-api | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-webapps | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| Debian:12 | tomcat10 | 10.1.55-1~deb12u1 | DEBIAN-CVE-2026-29146 |
| Debian:13 | tomcat10 | 10.1.55-1~deb13u1 | DEBIAN-CVE-2026-29146 |
| Debian:14 | tomcat10 | 10.1.54-1 | DEBIAN-CVE-2026-29146 |
| Debian:13 | tomcat11 | 11.0.22-1~deb13u1 | DEBIAN-CVE-2026-29146 |
| Debian:14 | tomcat11 | 11.0.21-1 | DEBIAN-CVE-2026-29146 |
| Debian:12 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-29146 |
| Debian:13 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-29146 |
| Debian:14 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-29146 |
| Maven | org.apache.tomcat:tomcat | 10.1.53 | GHSA-h468-7pvh-8vr8 |
| Maven | org.apache.tomcat:tomcat | no fix listed | GHSA-h468-7pvh-8vr8 |
| Maven | org.apache.tomcat:tomcat | no fix listed | GHSA-h468-7pvh-8vr8 |
| Maven | org.apache.tomcat:tomcat | 11.0.20 | GHSA-h468-7pvh-8vr8 |
| Maven | org.apache.tomcat:tomcat | 9.0.116 | GHSA-h468-7pvh-8vr8 |
| Maven | org.apache.tomcat:tomcat-tribes | no fix listed | GHSA-h468-7pvh-8vr8 |
| Maven | org.apache.tomcat:tomcat-tribes | 9.0.116 | GHSA-h468-7pvh-8vr8 |
| Maven | org.apache.tomcat:tomcat-tribes | 10.1.53 | GHSA-h468-7pvh-8vr8 |
| Maven | org.apache.tomcat:tomcat-tribes | 11.0.20 | GHSA-h468-7pvh-8vr8 |
| Maven | org.apache.tomcat:tomcat-tribes | no fix listed | GHSA-h468-7pvh-8vr8 |
| Rocky Linux:10 | tomcat | 1:10.1.49-3.el10_2 | RLSA-2026:36788 |
| Rocky Linux:8 | tomcat | 1:9.0.87-2.el8_10 | RLSA-2026:37137 |
| Rocky Linux:9 | tomcat | 1:9.0.117-2.el9_8 | RLSA-2026:36879 |
| Rocky Linux:10 | tomcat9 | 1:9.0.117-2.el10_2 | RLSA-2026:36790 |
| Ubuntu:24.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-29146 |
| Ubuntu:25.10 | tomcat10 | no fix listed | UBUNTU-CVE-2026-29146 |
| Ubuntu:26.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-29146 |
| Ubuntu:25.10 | tomcat11 | no fix listed | UBUNTU-CVE-2026-29146 |
| Ubuntu:26.04:LTS | tomcat11 | no fix listed | UBUNTU-CVE-2026-29146 |
| Ubuntu:24.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-29146 |
| Ubuntu:25.10 | tomcat9 | no fix listed | UBUNTU-CVE-2026-29146 |
| Ubuntu:26.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-29146 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – through 11.0.1810.0.0-M1 – through 10.1.529.0.13 – through 9.0.1158.5.38 – through 8.5.1007.0.100 – through 7.0.109 |
Weakness: CWE-209, CWE-642, CWE-1240 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://lists.apache.org/thread/lzt04z2pb3dc5tk85obn80xygw3z1p0w vendor-advisory
- http://www.openwall.com/lists/oss-security/2026/04/09/24
- https://access.redhat.com/security/cve/CVE-2026-29146 vdb-entry, x_refsource_REDHAT
- RHBZ#2457020 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29146.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:20405 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:39188 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:38505 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36787 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36789 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36788 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36790 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:37137 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:37136 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36878 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36876 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36877 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36879 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:20406 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:39189 vendor-advisory, x_refsource_REDHAT