UpHeron
All vulnerabilities

Servers and applications

CVE-2026-34483

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.

Severity
High 7.5
Published
9 Apr 2026
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
9.0.117, 10.1.54, 11.0.21
Sources
NVD

Affected software

SoftwareAffected versions
Apache TomcatServers and applications · cpe:a:apache:tomcat
  • From 9.0.40 before 9.0.117
  • From 10.1.0 before 10.1.54
  • From 11.0.0 before 11.0.21

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-34483
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-34483