CVE-2026-34483

HIGH

Apache Tomcat: Incomplete escaping of JSON access logs

Title source: cna
STIX 2.1

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.

References (2)

Scores

CVSS v3 7.5
EPSS 0.0008
EPSS Percentile 23.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-116
Status published
Products (9)
apache/tomcat 9.0.40 - 9.0.117
Apache Software Foundation/Apache Tomcat < 8.5.83
Apache Software Foundation/Apache Tomcat 10.1.0-M1 - 10.1.53
Apache Software Foundation/Apache Tomcat 11.0.0-M1 - 11.0.20
Apache Software Foundation/Apache Tomcat 8.5.84 - 8.5.100
Apache Software Foundation/Apache Tomcat 9.0.40 - 9.0.116
org.apache.tomcat/tomcat 9.0.40 - 9.0.116Maven
org.apache.tomcat/tomcat-catalina 9.0.40 - 9.0.116Maven
org.apache.tomcat.embed/tomcat-embed-core 9.0.40 - 9.0.116Maven
Published Apr 09, 2026
Tracked Since Apr 10, 2026