CVE-2026-34483 — Apache Tomcat: Incomplete escaping of JSON access logs

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Apache Software Foundation / Apache Tomcat	affected 11.0.0-M1 through 11.0.20; affected 10.1.0-M1 through 10.1.53; affected 9.0.40 through 9.0.116; affected 8.5.84 through 8.5.100; unaffected 0 through 8.5.83

CWE

CWE-116

References

https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228b

ADP enrichment

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2026/04/09/26

CISA-ADP

No English description supplied.

No references supplied.