Critical severity · published Jun 29, 2026
CVE-2026-55276
Apache Tomcat: Logged effective web.xml is incomplete
9.1
CVSS
0.6%
EPSS
No
On KEV
Description
Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty authorisation constraints were not included when the effective web.xml was logged.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.
Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119 which fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% 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 11.0.22; 10.1.0-M1 through 10.1.55; 9.0.0.M1 through 9.0.118; 8.5.0 through 8.5.100 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55276
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55276
Vendor Advisory
https://lists.apache.org/thread/jy09xjlzn6r2qwvqoph8vcmf959yq68v
Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/06/29/23
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