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CVE

CVE-2026-43512

Apache Tomcat - Digest authenticator will authenticate any unknown user
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CVE

CVE-2026-43512

Apache Tomcat - Digest authenticator will authenticate any unknown user

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

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Related Resources

No items found.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-43512, https://github.com/apache/tomcat/commit/3d4d3fae07a6cd9c2eb193c5491001740ec64448, https://github.com/apache/tomcat/commit/6565a6cb6499e56fe2f34457cec99f9d1c4f39e9, https://github.com/apache/tomcat/commit/a99c355e8199adbfd67c9a1fffbd85b810b196cd, https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73, https://tomcat.apache.org/security-10.html, https://tomcat.apache.org/security-11.html, https://tomcat.apache.org/security-9.html, http://www.openwall.com/lists/oss-security/2026/05/12/8

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.01233%
EPSS Percentile
0.66296%
Introduced Version
0,11.0.0-M5,10.1.8,9.0.74,8.5.88,11.0.0-M1,10.0.0-M1,9.0.0.M1,7.0.0,6.0.13,7.0.35
Fix Available
9.0.118,11.0.22,10.1.55,8.8.24-r2,8.9.5-r2,8.7.29-r1,8.8.24-r1,2025.4.3-r8,2026.0.2-r8,2026.1.0-r1,2025.4.3-r9,2026.0.2-r9,3.2.1-r3,3.2.2-r0,5.5.0-r9,5.5.0-r5,4.3.1.2-r0

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