CVE-2026-34483CWE-116

Apache Tomcat: Incomplete escaping of JSON access logs

High · published April 9, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
39.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00461 · 39.0th percentile
Weakness
CWE-116 · Improper Encoding or Escaping of Output
Published
2026-04-09T19:30Z
EPSS history
Timeline
  • 09 APR 19:30Z
    Apache Tomcat: Incomplete escaping of JSON access logs
    cvelistv5