Description
Session Fixation vulnerability in Apache Tomcat via rewrite valve.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.7, from 10.1.0-M1 through 10.1.41, from 9.0.0.M1 through 9.0.105.
Older, EOL versions may also be affected.
Users are recommended to upgrade to version 11.0.8, 10.1.42 or 9.0.106, which fix the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – ≤ 11.0.7, 10.1.0-M1 – ≤ 10.1.41, 9.0.0.M1 – ≤ 9.0.105 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tomcat10 | 10.1.46-1 | — |
| Debian 14 | tomcat11 | 11.0.11-1 | — |
| Debian 14 | tomcat9 | 9.0.70-2 | — |
| Debian 13 | tomcat10 | 10.1.52-1~deb13u1 | DSA-6120-1 |
| Debian 13 | tomcat11 | 11.0.15-1~deb13u1 | DSA-6121-1 |
| Debian 13 | tomcat9 | 9.0.70-2 | — |
| Debian 12 | tomcat10 | 10.1.52-1~deb12u1 | DSA-6120-1 |
| Debian 12 | tomcat9 | 9.0.70-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tomcat10 | No fix yet | — |
| Ubuntu 26.04 LTS | tomcat10 +1 | No fix yet | — |
| Ubuntu 25.10 | tomcat10 +1 | No fix yet | — |
| Ubuntu 24.04 LTS | tomcat10 | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | tomcat9 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | tomcat9 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | tomcat8 +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | tomcat8 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | tomcat +7 | 1:10.1.49-1.el10 | RHSA-2026:18537 |
| RHEL 10 | tomcat9 +7 | 1:9.0.110-2.el10_2 | RHSA-2026:18536 |
| RHEL 9 | tomcat +7 | 1:9.0.110-2.el9_8 | RHSA-2026:18916 |
| RHEL 8 | tomcat +7 | 1:9.0.120-1.el8_10 | RHSA-2026:68677 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | tomcat9 +7 | 1:9.0.120-1.el10_0 | RHSA-2026:67163 |
| RHEL 9.6 EUS | tomcat +7 | 1:9.0.120-1.el9_6 | RHSA-2026:68659 |
| RHEL 9.4 E4S | tomcat +7 | 1:9.0.120-1.el9_4 | RHSA-2026:68679 |
| RHEL 9.2 E4S | tomcat +7 | 1:9.0.120-1.el9_2 | RHSA-2026:68678 |
| RHEL 8.8 TUS | tomcat +7 | 1:9.0.120-1.el8_8 | RHSA-2026:68680 |
| RHEL 8.8 E4S | tomcat +7 | 1:9.0.120-1.el8_8 | RHSA-2026:68680 |
| Red Hat JBoss Web Server 6 | jws6-tomcat +9 | 10.1.49-7.redhat_00006.1.el8jws | RHSA-2026:2740 |
| Red Hat Hardened Images 1 | tomcat10 +9 | 10.1.54-1.hum1 | RHSA-2026:8334 |
| Red Hat Hardened Images 1 | tomcat11 +7 | 11.0.21-0.1.hum1 | RHSA-2026:6569 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | tomcat +7 | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | tomcat | 1:10.1.49-1.el10_2.1 | RLSA-2026:18537 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | tomcat10 +7 | 1:10.1.43-1.amzn2023.0.1 | ALAS2023-2025-1093 |
| Amazon Linux 2023 | tomcat9 +7 | 1:9.0.106-1.amzn2023.0.1 | ALAS2023-2025-1065 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | tomcat +7 | 1:10.1.49-3.el10_2 | ELSA-2026-18537 |
| Oracle Linux 10 | tomcat9 +7 | 1:9.0.117-2.el10_2 | ELSA-2026-18536 |
| Oracle Linux 9 | tomcat +7 | 1:9.0.117-1.el9_8 | ELSA-2026-18916 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
gregk4sec/CVE-2025-55668 ★ 0 · Aug 13, 2025
Apache Tomcat - Session fixation via rewrite valve
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.tomcat:tomcat-catalina | >= 11.0.0-M1, < 11.0.8 | 11.0.8 | GHSA-23hv-mwm6-g8jf |
| Maven | org.apache.tomcat:tomcat-catalina | >= 10.1.0-M1, < 10.1.42 | 10.1.42 | GHSA-23hv-mwm6-g8jf |
| Maven | org.apache.tomcat:tomcat-catalina | >= 9.0.0.M1, < 9.0.106 | 9.0.106 | GHSA-23hv-mwm6-g8jf |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 11.0.0-M1, < 11.0.8 | 11.0.8 | GHSA-23hv-mwm6-g8jf |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 10.1.0-M1, < 10.1.42 | 10.1.42 | GHSA-23hv-mwm6-g8jf |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 9.0.0.M1, < 9.0.106 | 9.0.106 | GHSA-23hv-mwm6-g8jf |
Advisories 24
- WID-SEC-2026-2189 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- ALSA-2026:68677 Important: tomcat security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:68680 Red Hat Security Advisory: tomcat security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:68679 Red Hat Security Advisory: tomcat security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:68678 Red Hat Security Advisory: tomcat security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:68677 Red Hat Security Advisory: tomcat security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:68659 Red Hat Security Advisory: tomcat security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:67163 Red Hat Security Advisory: tomcat9 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:6569 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:8334 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:18916 Red Hat Security Advisory: tomcat security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2026:18536 Red Hat Security Advisory: tomcat9 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2026:18537 Red Hat Security Advisory: tomcat security update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- RHSA-2026:2740 Red Hat Security Advisory: Red Hat JBoss Web Server 6.2.0 security release Red Hat Security Advisories (RHSA) · Sep 26, 2026
- WID-SEC-2025-1826 Apache Tomcat: Schwachstelle ermöglicht Session-Fixation BSI CERT-Bund (WID) · Jul 21, 2026
- ELSA-2026-18537 Important: tomcat security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 21, 2026
- ELSA-2026-18536 Important: tomcat9 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 21, 2026
- ELSA-2026-18916 Important: tomcat security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 29, 2026
- RLSA-2026:18537 Important: tomcat security update Rocky Linux Security Advisories · May 29, 2026
- DSA-6120-1 tomcat10 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-6121-1 tomcat11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2025-1905 IBM QRadar SIEM Komponente: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 4, 2026
- ALAS2023-2025-1093 Important: tomcat10 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 10, 2025
- ALAS2023-2025-1065 Important: tomcat9 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 27, 2025
References
- https://lists.apache.org/thread/v6bknr96rl7l1qxkl1c03v0qdvbbqs47 vendor-advisory