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Critical severity · published May 12, 2026
CVE-2026-43512
Apache Tomcat: Digest authenticator will authenticate any unknown user
9.8
CVSS
1.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TO
Tomcat · Apache
11.0.0-M1 through 11.0.21; 10.1.0-M1 through 10.1.54; 9.0.0.M1 through 9.0.117; 8.5.0 through 8.5.100; 7.0.0 through 7.0.109 · source: vendor, NVD
Affected product
TO
Tomcat
Apache
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43512
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43512
Mailing List
https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73
Mailing List
http://www.openwall.com/lists/oss-security/2026/05/12/8
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