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CVE-2026-34483

HIGH

CVE-2026-34483 is a high-severity (CVSS 7.5) CWE-116 vulnerability in org.apache.tomcat:tomcat-catalina. O3 Security confirms whether CVE-2026-34483 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Apache Tomcat: Incomplete escaping of JSON access logs

Also known asBIT-tomcat-2026-34483GHSA-rv64-5gf8-9qq8
Published
Apr 9, 2026
Updated
Jul 15, 2026
Affected
9 pkgs
Patched
9 / 9
Exploits
None indexed

Blast Radius

9 pkgs affected
org.apache.tomcat:tomcat-catalinaorg.apache.tomcat:tomcat-catalinaorg.apache.tomcat:tomcat-catalinaorg.apache.tomcat:tomcatorg.apache.tomcat:tomcatorg.apache.tomcat:tomcatorg.apache.tomcat.embed:tomcat-embed-coreorg.apache.tomcat.embed:tomcat-embed-core+1 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

9 total 9 fixed
EcosystemPackageVulnerable rangeFix
Mavenorg.apache.tomcat:tomcat-catalina9.0.40&&< 9.0.1169.0.116
Mavenorg.apache.tomcat:tomcat-catalina10.1.0-M1&&< 10.1.5410.1.54
Mavenorg.apache.tomcat:tomcat-catalina11.0.0-M1&&< 11.0.2111.0.21
Mavenorg.apache.tomcat:tomcat9.0.40&&< 9.0.1169.0.116
Mavenorg.apache.tomcat:tomcat10.1.0-M1&&< 10.1.5410.1.54
Mavenorg.apache.tomcat:tomcat11.0.0-M1&&< 11.0.2111.0.21

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat-catalina. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update org.apache.tomcat:tomcat-catalina to 9.0.116 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-34483 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2026-34483 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2026-34483. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is CVE-2026-34483 in your dependencies?

O3 detects CVE-2026-34483 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.