🛡️ CVE-2026-55276 on Ubuntu — tomcat10

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-55276 as tracked by Ubuntu, for the package tomcat10. The fix is available in version 8.5.39-1ubuntu1~18.04.3+esm6; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Affected software

UBUNTU-CVE-2026-55276 is recorded against 6 packages.

  • tomcat10
  • tomcat11
  • tomcat6
  • tomcat7
  • tomcat8 (fixed in 8.5.39-1ubuntu1~18.04.3+esm6)
  • tomcat9

Timeline and source

Published on 29 June 2026 and last revised on 30 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)
github.com (Report)
github.com (Report)
github.com (Report)
github.com (Report)
lists.apache.org (Report)
www.openwall.com (Report)
ubuntu.com (Advisory)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-06-29
Updated 2026-08-12
Modified 2026-07-30
Fix URL N/A

Affected Packages

Software From version Fixed in
tomcat10 — —
tomcat11 — —
tomcat6 — —
tomcat7 — —
tomcat8 — 8.5.39-1ubuntu1~18.04.3+esm6
tomcat9 — —

Exploit Protection

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UBUNTU-CVE-2026-55276 carries CVSS 9.5 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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