Description
Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121.
The following versions were EOS at the time the CVE was created but are
known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – ≤ 11.0.25, 10.1.0-M1 – ≤ 10.1.59, 9.0.0.M1 – ≤ 9.0.121, 8.5.0 – ≤ 8.5.100, 7.0.43 – ≤ 7.0.109 | — |
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 | No fix yet | — |
| Debian 14 | tomcat9 | 9.0.70-2 | — |
| Debian 13 | tomcat10 +1 | No fix yet | — |
| Debian 13 | tomcat9 | 9.0.70-2 | — |
| Debian 12 | tomcat10 | No fix yet | — |
| 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 | tomcat8 +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | tomcat7 +1 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | tomcat7 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | tomcat10 +9 | 10.1.60-0.1.hum1 | RHSA-2026:68257 |
| Red Hat Hardened Images 1 | tomcat11 +9 | 11.0.26-0.1.hum1 | RHSA-2026:68258 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libtcnative-1-0 | 1.3.9-150600.16.9.2 | SUSE-SU-2026:4544-1 |
| SLES 15 SP7 | tomcat | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 |
| SLES 15 SP7 | tomcat10 | 10.1.60-150200.5.82.2 | SUSE-SU-2026:4546-1 |
| SLES 15 SP7 | tomcat11 | 11.0.26-150600.13.36.2 | SUSE-SU-2026:4544-1 |
| SLES 15 SP6 | libtcnative-1-0 | 1.3.9-150600.16.9.2 | SUSE-SU-2026:4544-1 |
| SLES 15 SP6 | tomcat | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 |
| SLES 15 SP6 | tomcat10 | 10.1.60-150200.5.82.2 | SUSE-SU-2026:4546-1 |
| SLES 15 SP6 | tomcat11 | 11.0.26-150600.13.36.2 | SUSE-SU-2026:4544-1 |
| SLES 15 SP5 | libtcnative-1-0 | 1.3.9-150200.6.11.2 | SUSE-SU-2026:4546-1 |
| SLES 15 SP5 | tomcat | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 |
| SLES 15 SP5 | tomcat10 | 10.1.60-150200.5.82.2 | SUSE-SU-2026:4546-1 |
| SLES 15 SP4 | libtcnative-1-0 | 1.3.9-150200.6.11.2 | SUSE-SU-2026:4546-1 |
| SLES 15 SP4 | tomcat | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 |
| SLES 12 SP5 | libapr1 | 1.6.5-4.13.1 | SUSE-SU-2026:4927-1 |
| SLES 12 SP5 | libtcnative-1-0 | 1.3.9-3.9.1 | SUSE-SU-2026:4927-1 |
| SLES 12 SP5 | tomcat | 9.0.123-3.182.2 | SUSE-SU-2026:4927-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libtcnative-1-0 | 1.3.9-160000.1.1 | SUSE-SU-2026:23985-1 |
| SLES for SAP 16.0 | libtcnative-2-0 | 2.0.16-160000.1.1 | SUSE-SU-2026:23985-1 |
| SLES for SAP 16.0 | tomcat | 9.0.122-160000.1.1 | SUSE-SU-2026:23985-1 |
| SLES for SAP 16.0 | tomcat10 | 10.1.60-160000.1.1 | SUSE-SU-2026:23985-1 |
| SLES for SAP 16.0 | tomcat11 | 11.0.26-160000.1.1 | SUSE-SU-2026:23985-1 |
| SLES for SAP 15 SP6 | libtcnative-1-0 | 1.3.9-150600.16.9.2 | SUSE-SU-2026:4544-1 |
| SLES for SAP 15 SP6 | tomcat | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 |
| SLES for SAP 15 SP6 | tomcat10 | 10.1.60-150200.5.82.2 | SUSE-SU-2026:4546-1 |
| SLES for SAP 15 SP6 | tomcat11 | 11.0.26-150600.13.36.2 | SUSE-SU-2026:4544-1 |
| SLES for SAP 15 SP5 | libtcnative-1-0 | 1.3.9-150200.6.11.2 | SUSE-SU-2026:4546-1 |
| SLES for SAP 15 SP5 | tomcat | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 |
| SLES for SAP 15 SP5 | tomcat10 | 10.1.60-150200.5.82.2 | SUSE-SU-2026:4546-1 |
| SLES for SAP 15 SP4 | libtcnative-1-0 | 1.3.9-150200.6.11.2 | SUSE-SU-2026:4546-1 |
| SLES for SAP 15 SP4 | tomcat | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 |
| SLES 16.0 | libtcnative-1-0 | 1.3.9-160000.1.1 | SUSE-SU-2026:23985-1 |
| SLES 16.0 | libtcnative-2-0 | 2.0.16-160000.1.1 | SUSE-SU-2026:23985-1 |
| SLES 16.0 | tomcat | 9.0.122-160000.1.1 | SUSE-SU-2026:23985-1 |
| SLES 16.0 | tomcat10 | 10.1.60-160000.1.1 | SUSE-SU-2026:23985-1 |
| SLES 16.0 | tomcat11 | 11.0.26-160000.1.1 | SUSE-SU-2026:23985-1 |
| SLE HPC 15 SP5 | libtcnative-1-0 | 1.3.9-150200.6.11.2 | SUSE-SU-2026:4546-1 |
| SLE HPC 15 SP5 | tomcat | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 |
| SLE HPC 15 SP5 | tomcat10 | 10.1.60-150200.5.82.2 | SUSE-SU-2026:4546-1 |
| SLE HPC 15 SP4 | libtcnative-1-0 | 1.3.9-150200.6.11.2 | SUSE-SU-2026:4546-1 |
| SLE HPC 15 SP4 | tomcat | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tomcat | 9.0.122-1.1 | openSUSE-SU-2026:11906-1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.60-1.1 | openSUSE-SU-2026:11907-1 |
| openSUSE Tumbleweed | tomcat11 | 11.0.26-1.1 | openSUSE-SU-2026:11908-1 |
| openSUSE Leap 16.0 | libtcnative-1-0 | 1.3.9-160000.1.1 | openSUSE-SU-2026:21984-1 |
| openSUSE Leap 16.0 | libtcnative-2-0 | 2.0.16-160000.1.1 | openSUSE-SU-2026:21984-1 |
| openSUSE Leap 16.0 | tomcat | 9.0.122-160000.1.1 | openSUSE-SU-2026:21984-1 |
| openSUSE Leap 16.0 | tomcat10 | 10.1.60-160000.1.1 | openSUSE-SU-2026:21984-1 |
| openSUSE Leap 16.0 | tomcat11 | 11.0.26-160000.1.1 | openSUSE-SU-2026:21984-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | tomcat10 +7 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 |
| Amazon Linux 2023 | tomcat11 +7 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 |
| Amazon Linux 2023 | tomcat9 +7 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 |
| Amazon Linux 2 | tomcat +9 | 7.0.76-10.amzn2.0.19 | ALAS2-2026-4019 |
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
-
Ethen1212/tomcat-CVE-2026-76183 ★ 2 · Oct 23, 2026
Apache Tomcat WebSocket security constraint bypass (CVE-2026-76183) reproduction
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 15
- WID-SEC-2026-3527 Apache Tomcat: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 2026
- SUSE-SU-2026:4927-1 Security update for libapr1, libtcnative-1-0, tomcat SUSE / openSUSE Security Updates · Oct 31, 2026
- ALAS2-2026-4019 Important: tomcat security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- ALAS2023-2026-3151 Important: tomcat11 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- ALAS2023-2026-3165 Important: tomcat10 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- ALAS2023-2026-3166 Important: tomcat9 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- RHSA-2026:68258 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:68257 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- SUSE-SU-2026:4544-1 Security update for libtcnative-1-0, tomcat11 SUSE / openSUSE Security Updates · Oct 7, 2026
- SUSE-SU-2026:4546-1 Security update for libtcnative-1-0, tomcat, tomcat10 SUSE / openSUSE Security Updates · Oct 7, 2026
- SUSE-SU-2026:23985-1 Security update for libtcnative-1-0, libtcnative-2-0, tomcat, tomcat10, tomcat11 SUSE / openSUSE Security Updates · Oct 6, 2026
- openSUSE-SU-2026:21984-1 Security update for libtcnative-1-0, libtcnative-2-0, tomcat, tomcat10, tomcat11 SUSE / openSUSE Security Updates · Oct 1, 2026
- openSUSE-SU-2026:11906-1 tomcat-9.0.122-1.1 on GA media SUSE / openSUSE Security Updates · Sep 29, 2026
- openSUSE-SU-2026:11907-1 tomcat10-10.1.60-1.1 on GA media SUSE / openSUSE Security Updates · Sep 29, 2026
- openSUSE-SU-2026:11908-1 tomcat11-11.0.26-1.1 on GA media SUSE / openSUSE Security Updates · Sep 29, 2026
References
- https://lists.apache.org/thread/45mxk8nj2q8pkhct6lfxkvtm2jpywrsp vendor-advisory