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9.8
CVE-2026-43512: Apache Tomcat Digest Authentication Bypass Risk
CVE-2026-43512
BIT-tomcat-2026-43512
GHSA-h6fc-48rj-7qqh
Summary
Apache Tomcat versions 7 through 11 have a security issue that allows unauthorized access. This could happen if an attacker finds a way to bypass the authentication process, which is used to verify user identities. To fix this, update to a newer version of Apache Tomcat, specifically 11.0.22, 10.1.55, or 9.0.118.
What to do
- Update tomcat to version 9.0.118.
- Update org.apache.tomcat.embed:tomcat-embed-core to version 9.0.118.
- Update org.apache.tomcat.embed:tomcat-embed-core to version 10.1.55.
- Update org.apache.tomcat.embed:tomcat-embed-core to version 11.0.22.
- Update org.apache.tomcat:tomcat to version 9.0.118.
- Update org.apache.tomcat:tomcat to version 10.1.55.
- Update org.apache.tomcat:tomcat to version 11.0.22.
- Update org.apache.tomcat:tomcat-catalina to version 9.0.118.
- Update org.apache.tomcat:tomcat-catalina to version 10.1.55.
- Update org.apache.tomcat:tomcat-catalina to version 11.0.22.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Bitnami | – | tomcat |
>= 9.0.0.M1, < 9.0.118 Fix: upgrade to 9.0.118
|
| – | apache | tomcat |
>= 7.0.0, <= 7.0.109 >= 8.5.0, <= 8.5.100 >= 9.0.0, < 9.0.118 >= 10.1.0, < 10.1.55 >= 11.0.0, < 11.0.22 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* |
| maven | – | org.apache.tomcat.embed:tomcat-embed-core |
< 9.0.118 >= 10.1.0-M1, < 10.1.55 >= 11.0.0-M1, < 11.0.22 Fix: upgrade to 9.0.118
|
| maven | – | org.apache.tomcat:tomcat |
< 9.0.118 >= 10.1.0-M1, < 10.1.55 >= 11.0.0-M1, < 11.0.22 Fix: upgrade to 9.0.118
|
| maven | – | org.apache.tomcat:tomcat-catalina |
< 9.0.118 >= 10.1.0-M1, < 10.1.55 >= 11.0.0-M1, < 11.0.22 Fix: upgrade to 9.0.118
|
Original title
Apache Tomcat - Digest authenticator will authenticate any unknown user
Original description
Versions Affected:
Apache Tomcat 11.0.0-M1 to 11.0.21
Apache Tomcat 10.1.0-M1 to 10.1.54
Apache Tomcat 9.0.0.M1 to 9.0.117
Older, unsupported versions may also be affected
Description:
When DIGEST authentication was configured, any user not known to the
configured Realm would be authenticated if they presented the password
"null".
Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 11.0.22 or later
- Upgrade to Apache Tomcat 10.1.55 or later
- Upgrade to Apache Tomcat 9.0.118 or later
Apache Tomcat 11.0.0-M1 to 11.0.21
Apache Tomcat 10.1.0-M1 to 10.1.54
Apache Tomcat 9.0.0.M1 to 9.0.117
Older, unsupported versions may also be affected
Description:
When DIGEST authentication was configured, any user not known to the
configured Realm would be authenticated if they presented the password
"null".
Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 11.0.22 or later
- Upgrade to Apache Tomcat 10.1.55 or later
- Upgrade to Apache Tomcat 9.0.118 or later
Vulnerability type
CWE-592
CWE-287
Improper Authentication
- http://www.openwall.com/lists/oss-security/2026/05/12/8
- https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73
- https://nvd.nist.gov/vuln/detail/CVE-2026-43512 URL
- https://github.com/apache/tomcat/commit/3d4d3fae07a6cd9c2eb193c5491001740ec64448
- https://github.com/apache/tomcat/commit/6565a6cb6499e56fe2f34457cec99f9d1c4f39e9
- https://github.com/apache/tomcat/commit/a99c355e8199adbfd67c9a1fffbd85b810b196cd
- https://tomcat.apache.org/security-10.html
- https://tomcat.apache.org/security-11.html
- https://tomcat.apache.org/security-9.html
- https://github.com/advisories/GHSA-h6fc-48rj-7qqh
Published: 12 May 2026 · Updated: 28 May 2026 · First seen: 12 May 2026