CVE-2026-34483

Apache Tomcat: Incomplete escaping of JSON access logs

CVSS 7.5 HIGHEPSS 0.5%CWE-116

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.5EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

09 Apr 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.40 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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Apache Software Foundation · Apache Tomcat

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References

https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228b http://www.openwall.com/lists/oss-security/2026/04/09/26