CVE-2026-34483
Last modified
CVE-2026-34483 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.46% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apache | Tomcat | >= 9.0.40, < 9.0.117 |
| Apache | Tomcat | >= 10.1.0, < 10.1.54 |
| Apache | Tomcat | >= 11.0.0, < 11.0.21 |
References
- https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228bMailing List, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/09/26Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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