# CVE-2026-55955: tomcat11: Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in t...

CVE-2026-55955 is fixed in 25 products on 1 platform, first by RHSA-2026:67163, released May 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-55955
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0044
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 29, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | tomcat RHEL 8 | 1:9.0.120-1.el8_10 | [RHSA-2026:68677](https://patchblox.com/security/data/fix/linux/rhsa-2026-68677.md) | Sep 19, 2026 |
| Linux | tomcat RHEL 9 | 1:9.0.120-2.el9_8 | [RHSA-2026:68660](https://patchblox.com/security/data/fix/linux/rhsa-2026-68660.md) | Sep 19, 2026 |
| Linux | tomcat almalinux 8 | 1:9.0.120-1.el8_10 | [ALSA-2026:68677](https://patchblox.com/security/data/fix/linux/alsa-2026-68677.md) | Sep 17, 2026 |
| Linux | tomcat almalinux 9 | 1:9.0.120-2.el9_8 | [ALSA-2026:68660](https://patchblox.com/security/data/fix/linux/alsa-2026-68660.md) | Sep 17, 2026 |
| Linux | tomcat opensuse-leap 16.0 | 9.0.119-160000.1.1 | [OPENSUSE-SU-2026:21327-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21327-1.md) | Jul 13, 2026 |
| Linux | tomcat sles 15.7 | 9.0.119-150200.111.1 | [SUSE-SU-2026:3088-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3088-1.md) | Jul 16, 2026 |
| Linux | tomcat sles 16.0 | 9.0.119-160000.1.1 | [SUSE-SU-2026:22646-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22646-1.md) | Jul 13, 2026 |
| Linux | tomcat-admin-webapps RHEL 8 | 1:9.0.120-1.el8_10 | [RHSA-2026:68677](https://patchblox.com/security/data/fix/linux/rhsa-2026-68677.md) | Sep 19, 2026 |
| Linux | tomcat-admin-webapps RHEL 9 | 1:9.0.120-2.el9_8 | [RHSA-2026:68660](https://patchblox.com/security/data/fix/linux/rhsa-2026-68660.md) | Sep 19, 2026 |
| Linux | tomcat-admin-webapps almalinux 8 | 1:9.0.120-1.el8_10 | [ALSA-2026:68677](https://patchblox.com/security/data/fix/linux/alsa-2026-68677.md) | Sep 17, 2026 |
| Linux | tomcat-admin-webapps almalinux 9 | 1:9.0.120-2.el9_8 | [ALSA-2026:68660](https://patchblox.com/security/data/fix/linux/alsa-2026-68660.md) | Sep 17, 2026 |
| Linux | tomcat-docs-webapp RHEL 8 | 1:9.0.120-1.el8_10 | [RHSA-2026:68677](https://patchblox.com/security/data/fix/linux/rhsa-2026-68677.md) | Sep 19, 2026 |
| Linux | tomcat-docs-webapp RHEL 9 | 1:9.0.120-2.el9_8 | [RHSA-2026:68660](https://patchblox.com/security/data/fix/linux/rhsa-2026-68660.md) | Sep 19, 2026 |
| Linux | tomcat-docs-webapp almalinux 8 | 1:9.0.120-1.el8_10 | [ALSA-2026:68677](https://patchblox.com/security/data/fix/linux/alsa-2026-68677.md) | Sep 17, 2026 |
| Linux | tomcat-docs-webapp almalinux 9 | 1:9.0.120-2.el9_8 | [ALSA-2026:68660](https://patchblox.com/security/data/fix/linux/alsa-2026-68660.md) | Sep 17, 2026 |
| Linux | tomcat-el-3.0-api RHEL 8 | 1:9.0.120-1.el8_10 | [RHSA-2026:68677](https://patchblox.com/security/data/fix/linux/rhsa-2026-68677.md) | Sep 19, 2026 |
| Linux | tomcat-el-3.0-api RHEL 9 | 1:9.0.120-2.el9_8 | [RHSA-2026:68660](https://patchblox.com/security/data/fix/linux/rhsa-2026-68660.md) | Sep 19, 2026 |
| Linux | tomcat-el-3.0-api almalinux 8 | 1:9.0.120-1.el8_10 | [ALSA-2026:68677](https://patchblox.com/security/data/fix/linux/alsa-2026-68677.md) | Sep 17, 2026 |
| Linux | tomcat-el-3.0-api almalinux 9 | 1:9.0.120-2.el9_8 | [ALSA-2026:68660](https://patchblox.com/security/data/fix/linux/alsa-2026-68660.md) | Sep 17, 2026 |
| Linux | tomcat-jsp-2.3-api RHEL 8 | 1:9.0.120-1.el8_10 | [RHSA-2026:68677](https://patchblox.com/security/data/fix/linux/rhsa-2026-68677.md) | Sep 19, 2026 |
| Linux | tomcat-jsp-2.3-api RHEL 9 | 1:9.0.120-2.el9_8 | [RHSA-2026:68660](https://patchblox.com/security/data/fix/linux/rhsa-2026-68660.md) | Sep 19, 2026 |
| Linux | tomcat-jsp-2.3-api almalinux 8 | 1:9.0.120-1.el8_10 | [ALSA-2026:68677](https://patchblox.com/security/data/fix/linux/alsa-2026-68677.md) | Sep 17, 2026 |
| Linux | tomcat-jsp-2.3-api almalinux 9 | 1:9.0.120-2.el9_8 | [ALSA-2026:68660](https://patchblox.com/security/data/fix/linux/alsa-2026-68660.md) | Sep 17, 2026 |
| Linux | tomcat-lib RHEL 8 | 1:9.0.120-1.el8_10 | [RHSA-2026:68677](https://patchblox.com/security/data/fix/linux/rhsa-2026-68677.md) | Sep 19, 2026 |
| Linux | tomcat-lib RHEL 9 | 1:9.0.120-2.el9_8 | [RHSA-2026:68660](https://patchblox.com/security/data/fix/linux/rhsa-2026-68660.md) | Sep 19, 2026 |
| Linux | tomcat-lib almalinux 8 | 1:9.0.120-1.el8_10 | [ALSA-2026:68677](https://patchblox.com/security/data/fix/linux/alsa-2026-68677.md) | Sep 17, 2026 |
| Linux | tomcat-lib almalinux 9 | 1:9.0.120-2.el9_8 | [ALSA-2026:68660](https://patchblox.com/security/data/fix/linux/alsa-2026-68660.md) | Sep 17, 2026 |
| Linux | tomcat-servlet-4.0-api RHEL 8 | 1:9.0.120-1.el8_10 | [RHSA-2026:68677](https://patchblox.com/security/data/fix/linux/rhsa-2026-68677.md) | Sep 19, 2026 |
| Linux | tomcat-servlet-4.0-api RHEL 9 | 1:9.0.120-2.el9_8 | [RHSA-2026:68660](https://patchblox.com/security/data/fix/linux/rhsa-2026-68660.md) | Sep 19, 2026 |
| Linux | tomcat-servlet-4.0-api almalinux 8 | 1:9.0.120-1.el8_10 | [ALSA-2026:68677](https://patchblox.com/security/data/fix/linux/alsa-2026-68677.md) | Sep 17, 2026 |
| Linux | tomcat-servlet-4.0-api almalinux 9 | 1:9.0.120-2.el9_8 | [ALSA-2026:68660](https://patchblox.com/security/data/fix/linux/alsa-2026-68660.md) | Sep 17, 2026 |
| Linux | tomcat-webapps RHEL 8 | 1:9.0.120-1.el8_10 | [RHSA-2026:68677](https://patchblox.com/security/data/fix/linux/rhsa-2026-68677.md) | Sep 19, 2026 |
| Linux | tomcat-webapps RHEL 9 | 1:9.0.120-2.el9_8 | [RHSA-2026:68660](https://patchblox.com/security/data/fix/linux/rhsa-2026-68660.md) | Sep 19, 2026 |
| Linux | tomcat-webapps almalinux 8 | 1:9.0.120-1.el8_10 | [ALSA-2026:68677](https://patchblox.com/security/data/fix/linux/alsa-2026-68677.md) | Sep 17, 2026 |
| Linux | tomcat-webapps almalinux 9 | 1:9.0.120-2.el9_8 | [ALSA-2026:68660](https://patchblox.com/security/data/fix/linux/alsa-2026-68660.md) | Sep 17, 2026 |
| Linux | tomcat10 Debian 14 | 10.1.60-1 | [DEBIAN-CVE-2026-55955](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55955.md) | Jun 30, 2026 |
| Linux | tomcat10 amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | [ALAS2023-2026-1946](https://patchblox.com/security/data/fix/linux/alas2023-2026-1946.md) | Jul 20, 2026 |
| Linux | tomcat10 opensuse-leap 16.0 | 10.1.56-160000.1.1 | [OPENSUSE-SU-2026:21328-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21328-1.md) | Jul 13, 2026 |
| Linux | tomcat10 sles 15.7 | 10.1.56-150200.5.70.1 | [SUSE-SU-2026:3112-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3112-1.md) | Jul 17, 2026 |
| Linux | tomcat10 sles 16.0 | 10.1.56-160000.1.1 | [SUSE-SU-2026:22647-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22647-1.md) | Jul 13, 2026 |
| Linux | tomcat10-admin-webapps amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | [ALAS2023-2026-1946](https://patchblox.com/security/data/fix/linux/alas2023-2026-1946.md) | Jul 20, 2026 |
| Linux | tomcat10-docs-webapp amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | [ALAS2023-2026-1946](https://patchblox.com/security/data/fix/linux/alas2023-2026-1946.md) | Jul 20, 2026 |
| Linux | tomcat10-el-5.0-api amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | [ALAS2023-2026-1946](https://patchblox.com/security/data/fix/linux/alas2023-2026-1946.md) | Jul 20, 2026 |
| Linux | tomcat10-jsp-3.1-api amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | [ALAS2023-2026-1946](https://patchblox.com/security/data/fix/linux/alas2023-2026-1946.md) | Jul 20, 2026 |
| Linux | tomcat10-lib amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | [ALAS2023-2026-1946](https://patchblox.com/security/data/fix/linux/alas2023-2026-1946.md) | Jul 20, 2026 |
| Linux | tomcat10-servlet-6.0-api amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | [ALAS2023-2026-1946](https://patchblox.com/security/data/fix/linux/alas2023-2026-1946.md) | Jul 20, 2026 |
| Linux | tomcat10-webapps amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | [ALAS2023-2026-1946](https://patchblox.com/security/data/fix/linux/alas2023-2026-1946.md) | Jul 20, 2026 |
| Linux | tomcat11 Debian 14 | 11.0.24-1 | [DEBIAN-CVE-2026-55955](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55955.md) | Jun 30, 2026 |
| Linux | tomcat11 opensuse-leap 16.0 | 11.0.23-160000.1.1 | [OPENSUSE-SU-2026:21329-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21329-1.md) | Jul 13, 2026 |
| Linux | tomcat11 sles 15.7 | 11.0.23-150600.13.24.1 | [SUSE-SU-2026:3087-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3087-1.md) | Jul 16, 2026 |
| Linux | tomcat11 sles 16.0 | 11.0.23-160000.1.1 | [SUSE-SU-2026:22648-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22648-1.md) | Jul 13, 2026 |
| Linux | tomcat9 Debian 12.15 (bookworm) | 9.0.70-2 | [DEBIAN-CVE-2026-55955](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55955.md) | Jun 30, 2026 |
| Linux | tomcat9 Debian 13.5 (trixie) | 9.0.70-2 | [DEBIAN-CVE-2026-55955](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55955.md) | Jun 30, 2026 |
| Linux | tomcat9 Debian 14 | 9.0.70-2 | [DEBIAN-CVE-2026-55955](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55955.md) | Jun 30, 2026 |
| Linux | tomcat9 RHEL 10 | 9.0.120-1.el10_0 | [RHSA-2026:67163](https://patchblox.com/security/data/fix/linux/rhsa-2026-67163.md) | May 27, 2026 |
| Linux | tomcat9 almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | [ALSA-2026:68651](https://patchblox.com/security/data/fix/linux/alsa-2026-68651.md) | Sep 17, 2026 |
| Linux | tomcat9 amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | [ALAS2023-2026-1945](https://patchblox.com/security/data/fix/linux/alas2023-2026-1945.md) | Jul 20, 2026 |
| Linux | tomcat9-admin-webapps almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | [ALSA-2026:68651](https://patchblox.com/security/data/fix/linux/alsa-2026-68651.md) | Sep 17, 2026 |
| Linux | tomcat9-admin-webapps amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | [ALAS2023-2026-1945](https://patchblox.com/security/data/fix/linux/alas2023-2026-1945.md) | Jul 20, 2026 |
| Linux | tomcat9-docs-webapp almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | [ALSA-2026:68651](https://patchblox.com/security/data/fix/linux/alsa-2026-68651.md) | Sep 17, 2026 |
| Linux | tomcat9-docs-webapp amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | [ALAS2023-2026-1945](https://patchblox.com/security/data/fix/linux/alas2023-2026-1945.md) | Jul 20, 2026 |
| Linux | tomcat9-el-3.0-api almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | [ALSA-2026:68651](https://patchblox.com/security/data/fix/linux/alsa-2026-68651.md) | Sep 17, 2026 |
| Linux | tomcat9-el-3.0-api amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | [ALAS2023-2026-1945](https://patchblox.com/security/data/fix/linux/alas2023-2026-1945.md) | Jul 20, 2026 |
| Linux | tomcat9-jsp-2.3-api almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | [ALSA-2026:68651](https://patchblox.com/security/data/fix/linux/alsa-2026-68651.md) | Sep 17, 2026 |
| Linux | tomcat9-jsp-2.3-api amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | [ALAS2023-2026-1945](https://patchblox.com/security/data/fix/linux/alas2023-2026-1945.md) | Jul 20, 2026 |
| Linux | tomcat9-lib almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | [ALSA-2026:68651](https://patchblox.com/security/data/fix/linux/alsa-2026-68651.md) | Sep 17, 2026 |
| Linux | tomcat9-lib amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | [ALAS2023-2026-1945](https://patchblox.com/security/data/fix/linux/alas2023-2026-1945.md) | Jul 20, 2026 |
| Linux | tomcat9-servlet-4.0-api almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | [ALSA-2026:68651](https://patchblox.com/security/data/fix/linux/alsa-2026-68651.md) | Sep 17, 2026 |
| Linux | tomcat9-servlet-4.0-api amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | [ALAS2023-2026-1945](https://patchblox.com/security/data/fix/linux/alas2023-2026-1945.md) | Jul 20, 2026 |
| Linux | tomcat9-webapps almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | [ALSA-2026:68651](https://patchblox.com/security/data/fix/linux/alsa-2026-68651.md) | Sep 17, 2026 |
| Linux | tomcat9-webapps amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | [ALAS2023-2026-1945](https://patchblox.com/security/data/fix/linux/alas2023-2026-1945.md) | Jul 20, 2026 |

---

Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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