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Apache Tomcat: APR/Native Connector crash leading to DoS (CVE-2025-52434)

0
High
VulnerabilityCVE-2025-52434gcveosvubuntu-cve-2025-52434ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-pro-22-04-ltsbit-tomcat-2025-52434cve-2025-52434bitnami
Published: 05/18/2026 (05/18/2026, 08:57:54 UTC)
Source: GCVE Database
Product: tomcat

Description

A race condition vulnerability in Apache Tomcat's APR/Native connector can cause the server to crash, leading to a denial of service (DoS). This issue occurs when client-initiated closes of HTTP/2 connections happen concurrently, affecting Apache Tomcat versions from 8.5.0 through 8.5.100 and 9.0.0 through 9.0.106. The vulnerability has been fixed in version 9.0.107. Users are advised to upgrade to this version to mitigate the issue.

Affected software

Ubuntu:Pro:16.04:LTSmore threats →ghsa
tomcat8
pkg:deb/ubuntu/[email protected]+esm2?arch=source&distro=esm-infra-legacy/xenial
Affected versions
=8.0.26-1=8.0.28-1=8.0.30-1=8.0.32-1=8.0.32-1ubuntu1=8.0.32-1ubuntu1.1=8.0.32-1ubuntu1.2=8.0.32-1ubuntu1.3=8.0.32-1ubuntu1.4=8.0.32-1ubuntu1.5=8.0.32-1ubuntu1.6=8.0.32-1ubuntu1.7=8.0.32-1ubuntu1.8=8.0.32-1ubuntu1.9=8.0.32-1ubuntu1.10=8.0.32-1ubuntu1.11=8.0.32-1ubuntu1.13=8.0.32-1ubuntu1.13+esm1=8.0.32-1ubuntu1.13+esm2
Ubuntu:Pro:18.04:LTSmore threats →ghsa
tomcat8
pkg:deb/ubuntu/[email protected]~18.04.3+esm6?arch=source&distro=esm-apps/bionic
Affected versions
=8.5.21-1ubuntu1=8.5.29-1=8.5.30-1=8.5.30-1ubuntu1=8.5.30-1ubuntu1.2=8.5.30-1ubuntu1.3=8.5.30-1ubuntu1.4=8.5.39-1ubuntu1~18.04.1=8.5.39-1ubuntu1~18.04.2=8.5.39-1ubuntu1~18.04.3=8.5.39-1ubuntu1~18.04.3+esm1=8.5.39-1ubuntu1~18.04.3+esm2=8.5.39-1ubuntu1~18.04.3+esm3=8.5.39-1ubuntu1~18.04.3+esm4=8.5.39-1ubuntu1~18.04.3+esm5=8.5.39-1ubuntu1~18.04.3+esm6
Ubuntu:Pro:18.04:LTSmore threats →ghsa
tomcat9
pkg:deb/ubuntu/[email protected]+esm8?arch=source&distro=esm-apps/bionic
Affected versions
=9.0.16-3~18.04.1=9.0.16-3ubuntu0.18.04.1=9.0.16-3ubuntu0.18.04.2=9.0.16-3ubuntu0.18.04.2+esm1=9.0.16-3ubuntu0.18.04.2+esm2=9.0.16-3ubuntu0.18.04.2+esm3=9.0.16-3ubuntu0.18.04.2+esm4=9.0.16-3ubuntu0.18.04.2+esm5=9.0.16-3ubuntu0.18.04.2+esm6=9.0.16-3ubuntu0.18.04.2+esm7=9.0.16-3ubuntu0.18.04.2+esm8
Ubuntu:Pro:20.04:LTSmore threats →ghsa
tomcat9
pkg:deb/ubuntu/[email protected]+esm3?arch=source&distro=esm-apps/focal
Affected versions
=9.0.24-1=9.0.27-1=9.0.31-1=9.0.31-1ubuntu0.1=9.0.31-1ubuntu0.2=9.0.31-1ubuntu0.3=9.0.31-1ubuntu0.4=9.0.31-1ubuntu0.5=9.0.31-1ubuntu0.6=9.0.31-1ubuntu0.7=9.0.31-1ubuntu0.8=9.0.31-1ubuntu0.9=9.0.31-1ubuntu0.9+esm1=9.0.31-1ubuntu0.9+esm2=9.0.31-1ubuntu0.9+esm3
Ubuntu:Pro:22.04:LTSmore threats →ghsa
tomcat9
pkg:deb/ubuntu/[email protected]+esm4?arch=source&distro=esm-apps/jammy
Affected versions
=9.0.43-3=9.0.54-1=9.0.55-1=9.0.58-1=9.0.58-1ubuntu0.1=9.0.58-1ubuntu0.1+esm1=9.0.58-1ubuntu0.1+esm2=9.0.58-1ubuntu0.1+esm3=9.0.58-1ubuntu0.1+esm4=9.0.58-1ubuntu0.2=9.0.58-1ubuntu0.2+esm1=9.0.58-1ubuntu0.2+esm2=9.0.58-1ubuntu0.2+esm3=9.0.58-1ubuntu0.2+esm4

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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/08/2026, 15:07:20 UTC

Technical Analysis

CVE-2025-52434 is a race condition vulnerability in the Apache Tomcat APR/Native connector that leads to a crash and denial of service. The flaw arises from improper synchronization during concurrent execution involving shared resources, particularly noticeable when clients close HTTP/2 connections. This affects Apache Tomcat versions 8.5.0 through 8.5.100 and 9.0.0 through 9.0.106. The issue has been addressed and fixed in version 9.0.107.

Potential Impact

Exploitation of this vulnerability can cause the Apache Tomcat server to crash, resulting in denial of service. This disrupts availability of services relying on the affected Tomcat versions. There are no known exploits in the wild at this time.

Mitigation Recommendations

An official fix is available. Users should upgrade affected Apache Tomcat installations to version 9.0.107 or later to resolve this vulnerability. No additional mitigation steps are required beyond applying the update.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2025-52434
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS"]
Cvss Version
3.1

Threat ID: 6a58b50768715ace43db293e

Added to database: 07/16/2026, 10:40:07 UTC

Last enriched: 09/08/2026, 15:07:20 UTC

Last updated: 09/10/2026, 19:36:51 UTC

Views: 28

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