CVE-2026-55276
Apache Tomcat: Logged effective web.xml is incomplete
9.1
CRITICAL
CVSS 3.1
EPSS 0.37%
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 through 11.0.22, from 10.1.0 through 10.1.55, from 9.0.0 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.
How to fix CVE-2026-55276
To remediate CVE-2026-55276, upgrade the affected package to a fixed version below.
- —upgrade to 9.0.119 or later
Is CVE-2026-55276 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 9.0.119, >= 10.1.0, < 10.1.56, >= 11.0.0, < 11.0.23
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |