CVE-2026-34483
HIGH7.5EPSS 0.09%Apache Tomcat has an Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve
Published: 4/9/2026Modified: 4/28/2026
Description
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 packages (7)
- Bitnami/tomcat>= 9.0.40, < 9.0.117, >= 10.1.0, < 10.1.54, >= 11.0.0, < 11.0.21
- Debian/tomcat10from 0
- Debian/tomcat11from 0
- Debian/tomcat9from 0, < 9.0.70-2
- Maven/org.apache.tomcat.embed:tomcat-embed-core>= 9.0.40, < 9.0.116
- Maven/org.apache.tomcat:tomcat>= 9.0.40, < 9.0.116
- Maven/org.apache.tomcat:tomcat-catalina>= 9.0.40, < 9.0.116
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |