CVE-2026-34483
Apache Tomcat has an Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve
7.5
HIGH
CVSS 3.1
EPSS 0.07%
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.
How to fix CVE-2026-34483
To remediate CVE-2026-34483, upgrade the affected package to a fixed version below.
- —upgrade to 9.0.117 or later
- —no fix listed
- —no fix listed
- —upgrade to 9.0.70-2 or later
- —upgrade to 9.0.116 or later
- —upgrade to 9.0.116 or later
- —upgrade to 9.0.116 or later
Is CVE-2026-34483 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (7)
- >= 9.0.40, < 9.0.117, >= 10.1.0, < 10.1.54, >= 11.0.0, < 11.0.21
- from 0
- from 0
- from 0, < 9.0.70-2
- >= 9.0.40, < 9.0.116
- >= 9.0.40, < 9.0.116
- >= 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 |