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Vulnerability IntelligenceCVE-2026-34483

CVE-2026-34483

HIGH7.5

Apache Tomcat: Incomplete escaping of JSON access logs

Published Apr 9, 2026

Modified 1 weeks ago

Details

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

tomcat

fedora 42

References

http://www.openwall.com/lists/oss-security/2026/04/09/26

https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228b

https://www.cve.org/CVERecord?id=CVE-2026-34483

CVSS Analysis

CVSS v3.1

7.5

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

NoneI:N

Availability

NoneA:N

7.5/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness Type (CWE)

Input Validation

Improper Encoding/Escaping

Ecosystems

Timeline

PublishedApr 9, 2026

ModifiedApr 10, 2026

CVE-2026-34483 | Mondoo Vulnerability Intelligence