Vulnerability · Published May 12, 2026 · Assigned by apache
CVE-2026-43512Apache Tomcat: Digest authenticator will authenticate any unknown user
Critical 9.8
In plain English
A critical-severity security flaw in Apache Tomcat from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 71% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)1.3%top 28.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from before 7.0.0. Older unsupported versions any also be affect Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | tomcat | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat-admin-webapps | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat-admin-webapps | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-admin-webapps | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat-docs-webapp | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat-docs-webapp | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-docs-webapp | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:8 | tomcat-el-3.0-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-el-3.0-api | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat-el-5.0-api | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat-jsp-2.3-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-jsp-2.3-api | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat-jsp-3.1-api | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:10 | tomcat-lib | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat-lib | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-lib | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:8 | tomcat-servlet-4.0-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-servlet-4.0-api | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat-servlet-6.0-api | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:10 | tomcat-webapps | 1:10.1.49-4.el10_2.alma.1 | ALSA-2026:69259 |
| AlmaLinux:8 | tomcat-webapps | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-webapps | 1:9.0.120-2.el9_8 | ALSA-2026:68660 |
| AlmaLinux:10 | tomcat9 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-admin-webapps | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-docs-webapp | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-el-3.0-api | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-jsp-2.3-api | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-lib | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-servlet-4.0-api | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| AlmaLinux:10 | tomcat9-webapps | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 |
| Debian:12 | tomcat10 | 10.1.55-1~deb12u1 | DEBIAN-CVE-2026-43512 |
| Debian:13 | tomcat10 | 10.1.55-1~deb13u1 | DEBIAN-CVE-2026-43512 |
| Debian:14 | tomcat10 | 10.1.55-1 | DEBIAN-CVE-2026-43512 |
| Debian:13 | tomcat11 | 11.0.22-1~deb13u1 | DEBIAN-CVE-2026-43512 |
| Debian:14 | tomcat11 | 11.0.22-1 | DEBIAN-CVE-2026-43512 |
| Debian:12 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-43512 |
| Debian:13 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-43512 |
| Debian:14 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-43512 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 9.0.118 | GHSA-h6fc-48rj-7qqh |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 10.1.55 | GHSA-h6fc-48rj-7qqh |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 11.0.22 | GHSA-h6fc-48rj-7qqh |
| Maven | org.apache.tomcat:tomcat | 9.0.118 | GHSA-h6fc-48rj-7qqh |
| Maven | org.apache.tomcat:tomcat | 11.0.22 | GHSA-h6fc-48rj-7qqh |
| Maven | org.apache.tomcat:tomcat | 10.1.55 | GHSA-h6fc-48rj-7qqh |
| Maven | org.apache.tomcat:tomcat-catalina | 9.0.118 | GHSA-h6fc-48rj-7qqh |
| Maven | org.apache.tomcat:tomcat-catalina | 10.1.55 | GHSA-h6fc-48rj-7qqh |
| Maven | org.apache.tomcat:tomcat-catalina | 11.0.22 | GHSA-h6fc-48rj-7qqh |
| Rocky Linux:10 | tomcat | 1:10.1.49-4.el10_2 | RLSA-2026:69259 |
| Rocky Linux:8 | tomcat | 1:9.0.120-1.el8_10 | RLSA-2026:68677 |
| Rocky Linux:9 | tomcat | 1:9.0.120-2.el9_8 | RLSA-2026:68660 |
| Rocky Linux:10 | tomcat9 | 1:9.0.120-1.el10_2 | RLSA-2026:68651 |
| Ubuntu:25.10 | tomcat10 | 10.1.40-1ubuntu1.25.10.1 | UBUNTU-CVE-2026-43512 |
| Ubuntu:26.04:LTS | tomcat10 | 10.1.40-1ubuntu1.26.04.1 | UBUNTU-CVE-2026-43512 |
| Ubuntu:25.10 | tomcat11 | no fix listed | UBUNTU-CVE-2026-43512 |
| Ubuntu:26.04:LTS | tomcat11 | no fix listed | UBUNTU-CVE-2026-43512 |
| Ubuntu:25.10 | tomcat9 | 9.0.95-1ubuntu1.1 | UBUNTU-CVE-2026-43512 |
| Ubuntu:26.04:LTS | tomcat9 | 9.0.115-1ubuntu0.1 | UBUNTU-CVE-2026-43512 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – through 11.0.2110.1.0-M1 – through 10.1.549.0.0.M1 – through 9.0.1178.5.0 – through 8.5.1007.0.0 – through 7.0.109 |
Weakness: CWE-592 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H