Vulnerability · Published Jun 29, 2026 · Assigned by apache
CVE-2026-55955Apache Tomcat: EncryptInterceptor not protected against replay attacks
Medium 6.5
In plain English
A medium-severity improper authentication 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 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 61.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.23, 10.1.56, 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-2026-55955 |
| Debian:13 | tomcat10 | no fix listed | DEBIAN-CVE-2026-55955 |
| Debian:14 | tomcat10 | 10.1.60-1 | DEBIAN-CVE-2026-55955 |
| Debian:13 | tomcat11 | no fix listed | DEBIAN-CVE-2026-55955 |
| Debian:14 | tomcat11 | 11.0.24-1 | DEBIAN-CVE-2026-55955 |
| Debian:12 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-55955 |
| Debian:13 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-55955 |
| Debian:14 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-55955 |
| Maven | org.apache.tomcat:tomcat | 9.0.119 | GHSA-c5ph-rghf-fjfj |
| Maven | org.apache.tomcat:tomcat | no fix listed | GHSA-c5ph-rghf-fjfj |
| Maven | org.apache.tomcat:tomcat | no fix listed | GHSA-c5ph-rghf-fjfj |
| Maven | org.apache.tomcat:tomcat | 11.0.23 | GHSA-c5ph-rghf-fjfj |
| Maven | org.apache.tomcat:tomcat | 10.1.56 | GHSA-c5ph-rghf-fjfj |
| Maven | org.apache.tomcat:tomcat-tribes | 10.1.56 | GHSA-c5ph-rghf-fjfj |
| Maven | org.apache.tomcat:tomcat-tribes | no fix listed | GHSA-c5ph-rghf-fjfj |
| Maven | org.apache.tomcat:tomcat-tribes | no fix listed | GHSA-c5ph-rghf-fjfj |
| Maven | org.apache.tomcat:tomcat-tribes | 11.0.23 | GHSA-c5ph-rghf-fjfj |
| Maven | org.apache.tomcat:tomcat-tribes | 9.0.119 | GHSA-c5ph-rghf-fjfj |
| Ubuntu:24.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-55955 |
| Ubuntu:25.10 | tomcat10 | no fix listed | UBUNTU-CVE-2026-55955 |
| Ubuntu:26.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-55955 |
| Ubuntu:26.10 | tomcat10 | no fix listed | UBUNTU-CVE-2026-55955 |
| Ubuntu:25.10 | tomcat11 | no fix listed | UBUNTU-CVE-2026-55955 |
| Ubuntu:26.04:LTS | tomcat11 | no fix listed | UBUNTU-CVE-2026-55955 |
| Ubuntu:26.10 | tomcat11 | no fix listed | UBUNTU-CVE-2026-55955 |
| Ubuntu:24.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-55955 |
| Ubuntu:25.10 | tomcat9 | no fix listed | UBUNTU-CVE-2026-55955 |
| Ubuntu:26.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-55955 |
| Ubuntu:26.10 | tomcat9 | no fix listed | UBUNTU-CVE-2026-55955 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – through 11.0.2210.1.0-M1 – through 10.1.559.0.13 – through 9.0.1188.5.38 – through 8.5.1007.0.100 – through 7.0.109 |
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N