by Kastro
Paper/Archive/CVE-2026-55276

CVE-2026-55276

Apache Software Foundation Apache Tomcat — Apache Tomcat: Logged effective web.xml is incomplete

EPSS 0.6%CVSS 9.1
critical.is priorityof 100
37
CVSS 9.1 (ADP)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 49.0.490 × 209.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Apache Tomcat11.0.0-M1 – 11.0.22–CNA
Apache Tomcat10.1.0-M1 – 10.1.55–CNA
Apache Tomcat9.0.0.M1 – 9.0.118–CNA
Apache Tomcat8.5.0 – 8.5.100–CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorylists.apache.org/thread/jy09xjlzn6r2qwvqoph8vcmf959yq68vrefopenwall.com/lists/oss-security/2026/06/29/23