---
title: "CVE-2026-53434: Apache Tomcat util accepted misconfigured CRLs"
url: https://erroneo.us/security/cve/CVE-2026-53434/
description: "CVE-2026-53434 (org.apache.tomcat:tomcat-util (Maven)): Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-29
date_modified: 2026-10-23
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-53434"
kev: false
cvss: 9.1
epss: 0.00586
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-53434: Apache Tomcat util accepted misconfigured CRLs

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.6% , percentile 47: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 47% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes org.apache.tomcat:tomcat-util (Maven) >= 11.0.0-M1, <= 11.0.22, fixed in 11.0.23 ; org.apache.tomcat:tomcat-util (Maven) >= 10.1.0-M7, <= 10.1.55, fixed in 10.1.56 ; org.apache.tomcat:tomcat-util (Maven) >= 9.0.83, <= 9.0.118, fixed in 9.0.119 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Maven `org.apache.tomcat:tomcat-util` >= 11.0.0-M1, <= 11.0.22 → fixed: 11.0.23
- Maven `org.apache.tomcat:tomcat-util` >= 10.1.0-M7, <= 10.1.55 → fixed: 10.1.56
- Maven `org.apache.tomcat:tomcat-util` >= 9.0.83, <= 9.0.118 → fixed: 9.0.119

## Affected products (CVE record)

- Apache Software Foundation Apache Tomcat: 11.0.0-M1 <= 11.0.22, 10.1.0-M7 <= 10.1.55, 9.0.83 <= 9.0.118

## Severity

- CISA-ADP CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-23): 0.59% probability of exploitation activity in the next 30 days; percentile 47.

## Sources

- [lists.apache.org](https://lists.apache.org/thread/x510lbq0sfrd1qyo7q3r1mpllgpdcosk)
- [GitHub Advisory GHSA-4x29-79gh-6v8q](https://github.com/advisories/GHSA-4x29-79gh-6v8q)
- [CVE.org record CVE-2026-53434](https://www.cve.org/CVERecord?id=CVE-2026-53434)
- [NVD entry CVE-2026-53434](https://nvd.nist.gov/vuln/detail/CVE-2026-53434)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/06/29/22)
- [github.com](https://github.com/apache/tomcat/commit/7f8ecdbd930d8c5a7fae73aa0eec9124d919e2f5)
- [github.com](https://github.com/apache/tomcat/commit/c48ac39c27f4494f8c96b9d56a487253e362d276)
- [github.com](https://github.com/apache/tomcat/commit/feec60d6099727db6f911534f6a0f6926ebab070)

---
Source page: https://erroneo.us/security/cve/CVE-2026-53434/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt