Description
Improper Input Validation vulnerability.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0-M1 through 9.0.112.
The following versions were EOL at the time the CVE was created but are
known to be affected: 8.5.0 through 8.5.100. Older EOL versions are not affected.
Tomcat did not validate that the host name provided via the SNI
extension was the same as the host name provided in the HTTP host header
field. If Tomcat was configured with more than one virtual host and the
TLS configuration for one of those hosts did not require client
certificate authentication but another one did, it was possible for a
client to bypass the client certificate authentication by sending
different host names in the SNI extension and the HTTP host header field.
The vulnerability only applies if client certificate authentication is
only enforced at the Connector. It does not apply if client certificate
authentication is enforced at the web application.
Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fix the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – ≤ 11.0.14, 10.1.0-M1 – ≤ 10.1.49, 9.0.0-M1 – ≤ 9.0.112, 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 | 10.1.52-1 | — |
| Debian 14 | tomcat11 | 11.0.15-1 | — |
| 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 26.04 LTS | tomcat10 | No fix yet | — |
| Ubuntu 25.10 | tomcat9 +2 | No fix yet | — |
| Ubuntu 24.04 LTS | tomcat9 +1 | No fix yet | — |
Show 3 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 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | tomcat +7 | 1:9.0.117-1.el9_8 | RHSA-2026:26323 |
| 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 | 10.1.49-10.redhat_00008.1.el8jws | RHSA-2026:12194 |
| 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 10 | tomcat9 +7 | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:36790, ALSA-2026:25341 |
| AlmaLinux 9 | tomcat +7 | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| 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 | 1:9.0.117-1.el10_2 | RLSA-2026:25341 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | tomcat | 9.0.115-150200.102.1 | SUSE-SU-2026:1604-1, SUSE-SU-2026:0932-1 |
| SLES 15 SP7 | tomcat10 | 10.1.52-150200.5.61.1 | SUSE-SU-2026:1603-1, SUSE-SU-2026:0890-1 |
| SLES 15 SP7 | tomcat11 | 11.0.18-150600.13.15.1 | SUSE-SU-2026:1558-1, SUSE-SU-2026:0877-1 |
| SLES 15 SP6 | tomcat | 9.0.115-150200.102.1 | SUSE-SU-2026:1604-1, SUSE-SU-2026:0932-1 |
| SLES 15 SP6 | tomcat10 | 10.1.52-150200.5.61.1 | SUSE-SU-2026:1603-1, SUSE-SU-2026:0890-1 |
| SLES 15 SP6 | tomcat11 | 11.0.18-150600.13.15.1 | SUSE-SU-2026:1558-1, SUSE-SU-2026:0877-1 |
| SLES 15 SP5 | tomcat | 9.0.115-150200.102.1 | SUSE-SU-2026:1604-1, SUSE-SU-2026:0932-1 |
| SLES 15 SP5 | tomcat10 | 10.1.52-150200.5.61.1 | SUSE-SU-2026:1603-1, SUSE-SU-2026:0890-1 |
| SLES 15 SP4 | tomcat | 9.0.115-150200.102.1 | SUSE-SU-2026:1604-1, SUSE-SU-2026:0932-1 |
| SLES 12 SP5 | tomcat | 9.0.115-3.160.1 | SUSE-SU-2026:1572-1, SUSE-SU-2026:1058-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | tomcat10 | 10.1.52-160000.1.1 | SUSE-SU-2026:20982-1 |
| SLES for SAP 16.0 | tomcat11 | 11.0.18-160000.1.1 | SUSE-SU-2026:20926-1 |
| SLES for SAP 15 SP6 | tomcat | 9.0.115-150200.102.1 | SUSE-SU-2026:1604-1, SUSE-SU-2026:0932-1 |
| SLES for SAP 15 SP6 | tomcat10 | 10.1.52-150200.5.61.1 | SUSE-SU-2026:1603-1, SUSE-SU-2026:0890-1 |
| SLES for SAP 15 SP6 | tomcat11 | 11.0.18-150600.13.15.1 | SUSE-SU-2026:1558-1, SUSE-SU-2026:0877-1 |
| SLES for SAP 15 SP5 | tomcat | 9.0.115-150200.102.1 | SUSE-SU-2026:1604-1, SUSE-SU-2026:0932-1 |
| SLES for SAP 15 SP5 | tomcat10 | 10.1.52-150200.5.61.1 | SUSE-SU-2026:1603-1, SUSE-SU-2026:0890-1 |
| SLES for SAP 15 SP4 | tomcat | 9.0.115-150200.102.1 | SUSE-SU-2026:1604-1, SUSE-SU-2026:0932-1 |
| SLES 16.0 | tomcat10 | 10.1.52-160000.1.1 | SUSE-SU-2026:20982-1 |
| SLES 16.0 | tomcat11 | 11.0.18-160000.1.1 | SUSE-SU-2026:20926-1 |
| SLE HPC 15 SP5 | tomcat | 9.0.115-150200.102.1 | SUSE-SU-2026:1604-1, SUSE-SU-2026:0932-1 |
| SLE HPC 15 SP5 | tomcat10 | 10.1.52-150200.5.61.1 | SUSE-SU-2026:1603-1, SUSE-SU-2026:0890-1 |
| SLE HPC 15 SP4 | tomcat | 9.0.115-150200.102.1 | SUSE-SU-2026:1604-1, SUSE-SU-2026:0932-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tomcat | 9.0.115-1.1 | openSUSE-SU-2026:10305-1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.52-1.1 | openSUSE-SU-2026:10306-1 |
| openSUSE Tumbleweed | tomcat11 | 11.0.18-1.1 | openSUSE-SU-2026:10307-1 |
| openSUSE Leap 16.0 | tomcat | 9.0.115-160000.1.1 | openSUSE-SU-2026:20611-1, openSUSE-SU-2026:20350-1 |
| openSUSE Leap 16.0 | tomcat10 | 10.1.52-160000.1.1 | openSUSE-SU-2026:20612-1, openSUSE-SU-2026:20444-1 |
| openSUSE Leap 16.0 | tomcat11 | 11.0.18-160000.1.1 | openSUSE-SU-2026:20595-1, openSUSE-SU-2026:20414-1 |
| openSUSE Leap 15.6 | tomcat | 9.0.115-150200.102.1 | SUSE-SU-2026:0932-1 |
| openSUSE Leap 15.6 | tomcat10 | 10.1.52-150200.5.61.1 | SUSE-SU-2026:0890-1 |
| openSUSE Leap 15.6 | tomcat11 | 11.0.18-150600.13.15.1 | SUSE-SU-2026:0877-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | tomcat10 +7 | 1:10.1.52-1.amzn2023.0.1 | ALAS2023-2026-1497 |
| Amazon Linux 2023 | tomcat9 +7 | 1:9.0.115-1.amzn2023.0.1 | ALAS2023-2026-1496 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | thingsboard-tb-mqtt-transport | 4.3.0.1-r1 | — |
| Wolfi rolling | thingsboard-tb-node | 4.3.1-r2 | — |
Affected packages
Advisories 41
- ALSA-2026:26323 Important: tomcat security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:36790 Important: tomcat9 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:25341 Important: tomcat9 update AlmaLinux Security Advisories · Oct 29, 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-2026:68678 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-2026:68677 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-2026:26323 Red Hat Security Advisory: tomcat security update Red Hat Security Advisories (RHSA) · Oct 1, 2026
- RHSA-2026:12194 Red Hat Security Advisory: Red Hat JBoss Web Server 6.2.2 release and security update Red Hat Security Advisories (RHSA) · Sep 28, 2026
- RLSA-2026:25341 Important: tomcat9 security update Rocky Linux Security Advisories · Sep 28, 2026
- WID-SEC-2026-0443 Apache Tomcat und Tomcat Native: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 27, 2026
- WID-SEC-2026-1831 SAP Patchday Juni 2026: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 8, 2026
- WID-SEC-2026-0778 Dell Secure Connect Gateway Policy Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 11, 2026
- SUSE-SU-2026:1604-1 Security update for tomcat SUSE / openSUSE Security Updates · Apr 25, 2026
- SUSE-SU-2026:1603-1 Security update for tomcat10 SUSE / openSUSE Security Updates · Apr 25, 2026
- openSUSE-SU-2026:20611-1 Security update for tomcat SUSE / openSUSE Security Updates · Apr 24, 2026
- openSUSE-SU-2026:20612-1 Security update for tomcat10 SUSE / openSUSE Security Updates · Apr 24, 2026
- SUSE-SU-2026:1572-1 Security update for tomcat SUSE / openSUSE Security Updates · Apr 24, 2026
- SUSE-SU-2026:1558-1 Security update for tomcat11 SUSE / openSUSE Security Updates · Apr 24, 2026
- openSUSE-SU-2026:20595-1 Security update for tomcat11 SUSE / openSUSE Security Updates · Apr 23, 2026
- SUSE-SU-2026:20982-1 Security update for tomcat10 SUSE / openSUSE Security Updates · Apr 10, 2026
- openSUSE-SU-2026:20444-1 Security update for tomcat10 SUSE / openSUSE Security Updates · Apr 3, 2026
- SUSE-SU-2026:20926-1 Security update for tomcat11 SUSE / openSUSE Security Updates · Apr 2, 2026
- openSUSE-SU-2026:20414-1 Security update for tomcat11 SUSE / openSUSE Security Updates · Mar 29, 2026
- ALAS2023-2026-1496 Important: tomcat9 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Mar 27, 2026
- ALAS2023-2026-1497 Important: tomcat10 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Mar 27, 2026
- SUSE-SU-2026:1058-1 Security update for tomcat SUSE / openSUSE Security Updates · Mar 27, 2026
- openSUSE-SU-2026:20350-1 Security update for tomcat SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0932-1 Security update for tomcat SUSE / openSUSE Security Updates · Mar 20, 2026
- SUSE-SU-2026:0890-1 Security update for tomcat10 SUSE / openSUSE Security Updates · Mar 14, 2026
- SUSE-SU-2026:0877-1 Security update for tomcat11 SUSE / openSUSE Security Updates · Mar 13, 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
- openSUSE-SU-2026:10305-1 tomcat-9.0.115-1.1 on GA media SUSE / openSUSE Security Updates · Mar 8, 2026
- openSUSE-SU-2026:10306-1 tomcat10-10.1.52-1.1 on GA media SUSE / openSUSE Security Updates · Mar 8, 2026
- openSUSE-SU-2026:10307-1 tomcat11-11.0.18-1.1 on GA media SUSE / openSUSE Security Updates · Mar 8, 2026
References
- https://lists.apache.org/thread/vw6lxtlh2qbqwpb61wd3sv1flm2nttw7 vendor-advisory