# CVE-2026-34483

## Summary

- **CVE ID:** CVE-2026-34483
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
- **CWE:** CWE-116
- **Published:** Apr 9, 2026
- **Last Modified:** Apr 10, 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 Products

- Apache Software Foundation — Apache Tomcat (11.0.0-M1)
- Apache Software Foundation — Apache Tomcat (10.1.0-M1)
- Apache Software Foundation — Apache Tomcat (9.0.40)
- Apache Software Foundation — Apache Tomcat (8.5.84)
- Apache Software Foundation — Apache Tomcat (0)

## References

- [CNA](https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228b)
- [CVE](http://www.openwall.com/lists/oss-security/2026/04/09/26)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.46%
- **EPSS Percentile:** 38.6

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._