CVE-2025-52434: 
Java vulnerability analysis and mitigation

A critical race condition vulnerability (CVE-2025-52434) was discovered in Apache Tomcat's APR/Native connector implementation, particularly affecting HTTP/2 connections. The vulnerability affects Apache Tomcat versions from 9.0.0.M1 through 9.0.106. The issue was disclosed on July 4, 2025, and primarily manifests during client-initiated closes of HTTP/2 connections (ASEC Advisory, NVD).

The vulnerability is classified as a Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition) issue, identified as CWE-362. The CVSS v3.1 base score is 7.5 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The vulnerability specifically affects the APR/Native connector when processing HTTP/2 connections, where improper synchronization can occur during connection termination sequences (NVD, Cybersecurity News).

The vulnerability can lead to denial-of-service conditions by allowing attackers to exploit weaknesses in the HTTP/2 protocol handling mechanisms. When using the APR/Native connector, which provides enhanced performance through native library integration, servers become susceptible to resource exhaustion attacks when processing malformed or excessive HTTP/2 requests (Cybersecurity News).

Users are strongly recommended to upgrade to Apache Tomcat version 9.0.107, which contains the fix for this vulnerability. The security team addressed this issue through commit 8a83c3c4, which implements proper validation and resource management for HTTP/2 connections. System administrators utilizing APR/Native connectors with HTTP/2 enabled should prioritize this update (NVD, Cybersecurity News).