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Message-ID: <d1a2220d-54bc-4571-b1cb-932705d6eb98@apache.org>
Date: Thu, 9 Apr 2026 20:50:11 +0100
From: Mark Thomas <markt@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-34483: Apache Tomcat: Incomplete escaping of JSON access
logs
Severity: low
Affected versions:
- Apache Tomcat 11.0.0-M1 through 11.0.20
- Apache Tomcat 10.1.0-M1 through 10.1.53
- Apache Tomcat 9.0.40 through 9.0.116
- Apache Tomcat 8.5.84 through 8.5.100
- Apache Tomcat through 8.5.83 unaffected
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.
Credit:
Bartlomiej Dmitruk, striga.ai (finder)
References:
https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228b
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-34483
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