Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Tomcat | < 9.0.119 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/jy09xjlzn6r2qwvqoph8vcmf959yq68vVendor AdvisoryMailing List
- http://www.openwall.com/lists/oss-security/2026/06/29/23Third Party Advisory
FAQ
What is CVE-2026-55276?
CVE-2026-55276 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 ...
How severe is CVE-2026-55276?
CVE-2026-55276 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-55276?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Tomcat.