# CVE-2026-55957: tomcat: Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authentic...

CVE-2026-55957 is fixed in 25 products on 1 platform, first by ALAS2023-2025-910, released March 26, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-55957
- Priority: High
- CVSS: 7.3 (important)
- EPSS: 0.0286
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 26, 2025

## Description

Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | tomcat RHEL 10 | 10.1.49-1.el10_0 | [RHSA-2026:67164](https://patchblox.com/security/data/fix/linux/rhsa-2026-67164.md) | Jun 29, 2026 |
| 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 | 1:9.0.110-2.el9_8 | [RHSA-2026:18916](https://patchblox.com/security/data/fix/linux/rhsa-2026-18916.md) | May 27, 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 ol 8 | 1:9.0.120-1.el8_10 | [ELSA-2026-68677](https://patchblox.com/security/data/fix/linux/elsa-2026-68677.md) | Sep 17, 2026 |
| Linux | tomcat rocky 8 | 1:9.0.120-1.el8_10 | [RLSA-2026:68677](https://patchblox.com/security/data/fix/linux/rlsa-2026-68677.md) | Sep 19, 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 | 1:9.0.110-2.el9_8 | [RHSA-2026:18916](https://patchblox.com/security/data/fix/linux/rhsa-2026-18916.md) | May 27, 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 ol 8 | 1:9.0.120-1.el8_10 | [ELSA-2026-68677](https://patchblox.com/security/data/fix/linux/elsa-2026-68677.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 | 1:9.0.110-2.el9_8 | [RHSA-2026:18916](https://patchblox.com/security/data/fix/linux/rhsa-2026-18916.md) | May 27, 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 ol 8 | 1:9.0.120-1.el8_10 | [ELSA-2026-68677](https://patchblox.com/security/data/fix/linux/elsa-2026-68677.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 | 1:9.0.110-2.el9_8 | [RHSA-2026:18916](https://patchblox.com/security/data/fix/linux/rhsa-2026-18916.md) | May 27, 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 ol 8 | 1:9.0.120-1.el8_10 | [ELSA-2026-68677](https://patchblox.com/security/data/fix/linux/elsa-2026-68677.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 | 1:9.0.110-2.el9_8 | [RHSA-2026:18916](https://patchblox.com/security/data/fix/linux/rhsa-2026-18916.md) | May 27, 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 ol 8 | 1:9.0.120-1.el8_10 | [ELSA-2026-68677](https://patchblox.com/security/data/fix/linux/elsa-2026-68677.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 | 1:9.0.110-2.el9_8 | [RHSA-2026:18916](https://patchblox.com/security/data/fix/linux/rhsa-2026-18916.md) | May 27, 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 ol 8 | 1:9.0.120-1.el8_10 | [ELSA-2026-68677](https://patchblox.com/security/data/fix/linux/elsa-2026-68677.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 | 1:9.0.110-2.el9_8 | [RHSA-2026:18916](https://patchblox.com/security/data/fix/linux/rhsa-2026-18916.md) | May 27, 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 ol 8 | 1:9.0.120-1.el8_10 | [ELSA-2026-68677](https://patchblox.com/security/data/fix/linux/elsa-2026-68677.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 | 1:9.0.110-2.el9_8 | [RHSA-2026:18916](https://patchblox.com/security/data/fix/linux/rhsa-2026-18916.md) | May 27, 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 ol 8 | 1:9.0.120-1.el8_10 | [ELSA-2026-68677](https://patchblox.com/security/data/fix/linux/elsa-2026-68677.md) | Sep 17, 2026 |
| Linux | tomcat10 Debian 12.15 (bookworm) | 10.1.52-1~deb12u1 | [DEBIAN-CVE-2026-55957](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55957.md) | Jun 30, 2026 |
| Linux | tomcat10 Debian 13.5 (trixie) | 10.1.52-1~deb13u1 | [DEBIAN-CVE-2026-55957](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55957.md) | Jun 30, 2026 |
| Linux | tomcat10 Debian 14 | 10.1.40-1 | [DEBIAN-CVE-2026-55957](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55957.md) | Jun 30, 2026 |
| Linux | tomcat10 amzn 2023 | 1:10.1.39-1.amzn2023.0.1 | [ALAS2023-2025-910](https://patchblox.com/security/data/fix/linux/alas2023-2025-910.md) | Mar 26, 2025 |
| Linux | tomcat10-admin-webapps amzn 2023 | 1:10.1.39-1.amzn2023.0.1 | [ALAS2023-2025-910](https://patchblox.com/security/data/fix/linux/alas2023-2025-910.md) | Mar 26, 2025 |
| Linux | tomcat10-docs-webapp amzn 2023 | 1:10.1.39-1.amzn2023.0.1 | [ALAS2023-2025-910](https://patchblox.com/security/data/fix/linux/alas2023-2025-910.md) | Mar 26, 2025 |
| Linux | tomcat10-el-5.0-api amzn 2023 | 1:10.1.39-1.amzn2023.0.1 | [ALAS2023-2025-910](https://patchblox.com/security/data/fix/linux/alas2023-2025-910.md) | Mar 26, 2025 |
| Linux | tomcat10-jsp-3.1-api amzn 2023 | 1:10.1.39-1.amzn2023.0.1 | [ALAS2023-2025-910](https://patchblox.com/security/data/fix/linux/alas2023-2025-910.md) | Mar 26, 2025 |
| Linux | tomcat10-lib amzn 2023 | 1:10.1.39-1.amzn2023.0.1 | [ALAS2023-2025-910](https://patchblox.com/security/data/fix/linux/alas2023-2025-910.md) | Mar 26, 2025 |
| Linux | tomcat10-servlet-6.0-api amzn 2023 | 1:10.1.39-1.amzn2023.0.1 | [ALAS2023-2025-910](https://patchblox.com/security/data/fix/linux/alas2023-2025-910.md) | Mar 26, 2025 |
| Linux | tomcat10-webapps amzn 2023 | 1:10.1.39-1.amzn2023.0.1 | [ALAS2023-2025-910](https://patchblox.com/security/data/fix/linux/alas2023-2025-910.md) | Mar 26, 2025 |
| Linux | tomcat11 Debian 13.5 (trixie) | 11.0.15-1~deb13u1 | [DEBIAN-CVE-2026-55957](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55957.md) | Jun 30, 2026 |
| Linux | tomcat11 Debian 14 | 11.0.5-1 | [DEBIAN-CVE-2026-55957](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55957.md) | Jun 30, 2026 |
| Linux | tomcat9 Debian 12.15 (bookworm) | 9.0.70-2 | [DEBIAN-CVE-2026-55957](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55957.md) | Jun 30, 2026 |
| Linux | tomcat9 Debian 13.5 (trixie) | 9.0.70-2 | [DEBIAN-CVE-2026-55957](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55957.md) | Jun 30, 2026 |
| Linux | tomcat9 Debian 14 | 9.0.70-2 | [DEBIAN-CVE-2026-55957](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55957.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 amzn 2023 | 1:9.0.102-1.amzn2023.0.1 | [ALAS2023-2025-911](https://patchblox.com/security/data/fix/linux/alas2023-2025-911.md) | Mar 26, 2025 |
| Linux | tomcat9-admin-webapps amzn 2023 | 1:9.0.102-1.amzn2023.0.1 | [ALAS2023-2025-911](https://patchblox.com/security/data/fix/linux/alas2023-2025-911.md) | Mar 26, 2025 |
| Linux | tomcat9-docs-webapp amzn 2023 | 1:9.0.102-1.amzn2023.0.1 | [ALAS2023-2025-911](https://patchblox.com/security/data/fix/linux/alas2023-2025-911.md) | Mar 26, 2025 |
| Linux | tomcat9-el-3.0-api amzn 2023 | 1:9.0.102-1.amzn2023.0.1 | [ALAS2023-2025-911](https://patchblox.com/security/data/fix/linux/alas2023-2025-911.md) | Mar 26, 2025 |
| Linux | tomcat9-jsp-2.3-api amzn 2023 | 1:9.0.102-1.amzn2023.0.1 | [ALAS2023-2025-911](https://patchblox.com/security/data/fix/linux/alas2023-2025-911.md) | Mar 26, 2025 |
| Linux | tomcat9-lib amzn 2023 | 1:9.0.102-1.amzn2023.0.1 | [ALAS2023-2025-911](https://patchblox.com/security/data/fix/linux/alas2023-2025-911.md) | Mar 26, 2025 |
| Linux | tomcat9-servlet-4.0-api amzn 2023 | 1:9.0.102-1.amzn2023.0.1 | [ALAS2023-2025-911](https://patchblox.com/security/data/fix/linux/alas2023-2025-911.md) | Mar 26, 2025 |
| Linux | tomcat9-webapps amzn 2023 | 1:9.0.102-1.amzn2023.0.1 | [ALAS2023-2025-911](https://patchblox.com/security/data/fix/linux/alas2023-2025-911.md) | Mar 26, 2025 |

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Data as of 2026-11-09T01:18:40Z 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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