🛡️ CVE-2026-43513 on Ubuntu — tomcat10

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

Description

Improper Handling of Case Sensitivity vulnerability in LockOutRealm in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Older unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Distribution advisory

This page covers CVE-2026-43513 as tracked by Ubuntu, for the package tomcat10. The fix is available in version 10.1.40-1ubuntu1.26.04.1; 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 none, availability none.

Affected software

UBUNTU-CVE-2026-43513 is recorded against 6 packages.

  • tomcat10 (fixed in 10.1.40-1ubuntu1.26.04.1)
  • tomcat11
  • tomcat6 (fixed in 6.0.39-1ubuntu0.1+esm3)
  • tomcat7 (fixed in 7.0.68-1ubuntu0.4+esm4)
  • tomcat8
  • tomcat9 (fixed in 9.0.115-1ubuntu0.1)

Timeline and source

Published on 12 May 2026 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

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

CVE-2026-43513 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

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:N/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-05-12
Updated 2026-08-12
Modified 2026-07-15
Fix URL N/A

Affected Packages

Software From version Fixed in
tomcat10 — 10.1.40-1ubuntu1.26.04.1
tomcat11 — —
tomcat6 — 6.0.39-1ubuntu0.1+esm3
tomcat7 — 7.0.68-1ubuntu0.4+esm4
tomcat8 — —
tomcat9 — 9.0.115-1ubuntu0.1

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