Description
Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.
Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – ≤ 11.0.23, 10.1.0-M1 – ≤ 10.1.56, 9.0.0.M1 – ≤ 9.0.119, 8.5.0 – ≤ 8.5.100 | — |
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 | 10.1.60-1 | — |
| Debian 14 | tomcat11 | 11.0.24-1 | — |
| Debian 14 | tomcat9 | 9.0.70-2 | — |
| Debian 13 | tomcat10 | 10.1.60-1~deb13u1 | — |
| Debian 13 | tomcat11 | No fix yet | — |
| Debian 13 | tomcat9 | 9.0.70-2 | — |
| Debian 12 | tomcat10 | 10.1.60-1~deb12u1 | — |
| Debian 12 | tomcat9 | 9.0.70-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tomcat9 +2 | No fix yet | — |
| Ubuntu 26.04 LTS | tomcat9 +2 | No fix yet | — |
| Ubuntu 24.04 LTS | tomcat9 +1 | No fix yet | — |
Show 5 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 | tomcat9 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | tomcat7 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | tomcat6 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | tomcat9 +7 | 1:9.0.120-1.el10_2 | RHSA-2026:68651 |
| RHEL 9 | tomcat +7 | 1:9.0.120-2.el9_8 | RHSA-2026:68660 |
| RHEL 8 | tomcat +7 | 1:9.0.120-1.el8_10 | RHSA-2026:68677 |
Show 9 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 7 | jws7-tomcat +9 | 11.0.21-6.redhat_00005.1.el8jws | RHSA-2026:49951 |
| Red Hat JBoss Web Server 6 | jws6-tomcat +9 | 10.1.49-16.redhat_00016.1.el8jws | RHSA-2026:73981 |
| Red Hat Hardened Images 1 | tomcat10 +9 | 10.1.57-1.hum1 | RHSA-2026:37767 |
| Red Hat Hardened Images 1 | tomcat11 +9 | 11.0.24-0.1.hum1 | RHSA-2026:36872 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | tomcat9 +7 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux 9 | tomcat +7 | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| 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 | tomcat9 | 1:9.0.120-1.el10_2 | RLSA-2026:99174, RLSA-2026:68651 |
| Rocky Linux 10 | tomcat9-lib +6 | 1:9.0.120-2.el10_3 | RLSA-2026:99174 |
| Rocky Linux 9 | tomcat | 1:9.0.120-2.el9_8 | RLSA-2026:68660 |
| Rocky Linux 8 | tomcat | 1:9.0.120-1.el8_10 | RLSA-2026:68677 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | tomcat | 9.0.120-150200.114.1 | SUSE-SU-2026:3419-1 |
| SLES 15 SP7 | tomcat10 | 10.1.57-150200.5.73.1 | SUSE-SU-2026:3418-1 |
| SLES 15 SP7 | tomcat11 | 11.0.24-150600.13.27.1 | SUSE-SU-2026:3430-1 |
| SLES 15 SP6 | tomcat | 9.0.120-150200.114.1 | SUSE-SU-2026:3419-1 |
| SLES 15 SP6 | tomcat10 | 10.1.57-150200.5.73.1 | SUSE-SU-2026:3418-1 |
| SLES 15 SP6 | tomcat11 | 11.0.24-150600.13.27.1 | SUSE-SU-2026:3430-1 |
| SLES 15 SP5 | tomcat | 9.0.120-150200.114.1 | SUSE-SU-2026:3419-1 |
| SLES 15 SP5 | tomcat10 | 10.1.57-150200.5.73.1 | SUSE-SU-2026:3418-1 |
| SLES 15 SP4 | tomcat | 9.0.120-150200.114.1 | SUSE-SU-2026:3419-1 |
| SLES 12 SP5 | tomcat | 9.0.120-3.174.1 | SUSE-SU-2026:3440-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | tomcat | 9.0.120-150200.114.1 | SUSE-SU-2026:3419-1 |
| SLES for SAP 15 SP6 | tomcat10 | 10.1.57-150200.5.73.1 | SUSE-SU-2026:3418-1 |
| SLES for SAP 15 SP6 | tomcat11 | 11.0.24-150600.13.27.1 | SUSE-SU-2026:3430-1 |
| SLES for SAP 15 SP5 | tomcat | 9.0.120-150200.114.1 | SUSE-SU-2026:3419-1 |
| SLES for SAP 15 SP5 | tomcat10 | 10.1.57-150200.5.73.1 | SUSE-SU-2026:3418-1 |
| SLES for SAP 15 SP4 | tomcat | 9.0.120-150200.114.1 | SUSE-SU-2026:3419-1 |
| SLE HPC 15 SP5 | tomcat | 9.0.120-150200.114.1 | SUSE-SU-2026:3419-1 |
| SLE HPC 15 SP5 | tomcat10 | 10.1.57-150200.5.73.1 | SUSE-SU-2026:3418-1 |
| SLE HPC 15 SP4 | tomcat | 9.0.120-150200.114.1 | SUSE-SU-2026:3419-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tomcat | 9.0.120-1.1 | openSUSE-SU-2026:11399-1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.57-1.1 | openSUSE-SU-2026:11400-1 |
| openSUSE Tumbleweed | tomcat11 | 11.0.24-1.1 | openSUSE-SU-2026:11401-1 |
| openSUSE Leap 16.0 | tomcat | 9.0.120-160000.1.1 | openSUSE-SU-2026:21486-1 |
| openSUSE Leap 16.0 | tomcat10 | 10.1.57-160000.1.1 | openSUSE-SU-2026:21487-1 |
| openSUSE Leap 16.0 | tomcat11 | 11.0.24-160000.1.1 | openSUSE-SU-2026:21490-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | tomcat10 +7 | 1:10.1.57-1.amzn2023.0.1 | ALAS2023-2026-1946 |
| Amazon Linux 2023 | tomcat9 +7 | 1:9.0.120-1.amzn2023.0.1 | ALAS2023-2026-1945 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | tomcat9 +7 | 1:9.0.120-1.el10_2 | ELSA-2026-68651 |
| Oracle Linux 9 | tomcat +7 | 1:9.0.120-2.el9_8 | ELSA-2026-68660 |
| Oracle Linux 8 | tomcat +7 | 1:9.0.120-1.el8_10 | ELSA-2026-68677 |
Advisories 37
- RLSA-2026:99174 Moderate: tomcat9 security update Rocky Linux Security Advisories · Nov 13, 2026
- WID-SEC-2026-2310 Apache Tomcat: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- ALSA-2026:68660 Moderate: tomcat security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:68651 Moderate: tomcat9 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:68677 Important: tomcat security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-4084 Oracle Siebel CRM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 20, 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-2026:68660 Red Hat Security Advisory: tomcat security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:68651 Red Hat Security Advisory: tomcat9 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-2026:73981 Red Hat Security Advisory: Red Hat JBoss Web Server 6.2.5 release and security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:49951 Red Hat Security Advisory: Red Hat JBoss Web Server 7.0.1 release and security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:37767 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:36872 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RLSA-2026:68651 Moderate: tomcat9 security update Rocky Linux Security Advisories · Sep 19, 2026
- RLSA-2026:68660 Moderate: tomcat security, bug fix, and enhancement update Rocky Linux Security Advisories · Sep 19, 2026
- RLSA-2026:68677 Important: tomcat security update Rocky Linux Security Advisories · Sep 19, 2026
- ELSA-2026-68651 Moderate: tomcat9 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 18, 2026
- WID-SEC-2026-3043 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- ELSA-2026-68660 Moderate: tomcat security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 17, 2026
- ELSA-2026-68677 Important: tomcat security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 17, 2026
- SUSE-SU-2026:3440-1 Security update for tomcat SUSE / openSUSE Security Updates · Aug 3, 2026
- openSUSE-SU-2026:21486-1 Security update for tomcat SUSE / openSUSE Security Updates · Jul 31, 2026
- openSUSE-SU-2026:21487-1 Security update for tomcat10 SUSE / openSUSE Security Updates · Jul 31, 2026
- openSUSE-SU-2026:21490-1 Security update for tomcat11 SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:3430-1 Security update for tomcat11 SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:3418-1 Security update for tomcat10 SUSE / openSUSE Security Updates · Jul 30, 2026
- SUSE-SU-2026:3419-1 Security update for tomcat SUSE / openSUSE Security Updates · Jul 30, 2026
- openSUSE-SU-2026:11400-1 tomcat10-10.1.57-1.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026
- openSUSE-SU-2026:11401-1 tomcat11-11.0.24-1.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026
- openSUSE-SU-2026:11399-1 tomcat-9.0.120-1.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026
- ALAS2023-2026-1945 Moderate: tomcat9 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 29, 2026
- ALAS2023-2026-1946 Moderate: tomcat10 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 29, 2026
References
- https://lists.apache.org/thread/3g63zos2gkjo5vgnrk8kxmosv47w6wbq vendor-advisory