🛡️ CVE-2026-34487 on Debian — tomcat10

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

Description

Insertion of Sensitive Information into Log File vulnerability in the cloud membership for clustering component of Apache Tomcat exposed the Kubernetes bearer token. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.13 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fix the issue.

Distribution advisory

This page covers CVE-2026-34487 as tracked by Debian, for the package tomcat10. The fix is available in version 10.1.54-1; 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.

Weakness class

DEBIAN-CVE-2026-34487 is classified as CWE-532: Insertion of Sensitive Information into Log File. Sensitive values are written to logs, which are typically kept longer and read more widely than the data warrants.

Affected software

DEBIAN-CVE-2026-34487 is recorded against 3 packages.

  • tomcat10 (fixed in 10.1.54-1)
  • tomcat11 (fixed in 11.0.21-1)
  • tomcat9 (fixed in 9.0.70-2)

Timeline and source

Published on 9 April 2026 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2026-34487 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 2026-04-09
Updated 2026-08-20
Modified 2026-08-04
Fix URL N/A

Affected Packages

Software From version Fixed in
tomcat10 — 10.1.54-1
tomcat11 — 11.0.21-1
tomcat9 — 9.0.70-2

Site Security Check

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