CVE-2026-49432: CWE-20 Improper Input Validation in Apache Software Foundation Apache ActiveMQ
Improper Input Validation vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp. A remote unauthenticated peer that can reach an exposed STOMP connector can trigger denial-of-service behavior by sending a negative content-length. For the NIO STOMP transport, an attacker can keep streaming body bytes and grow the per-connection command buffer beyond configured limits to cause OOM. For the blocking STOMP protocol, an error will instead force abnormal transport exception handling for the affected connection and closure. This issue affects Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ Stomp: before 5.19.8, from 6.0.0 before 6.2.7. Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.
AI Analysis
Technical Summary
CVE-2026-49432 is an improper input validation vulnerability (CWE-20) in Apache ActiveMQ's STOMP connector. A remote unauthenticated attacker can send a negative content-length value to trigger denial-of-service conditions. For the NIO STOMP transport, this can cause the per-connection command buffer to grow beyond configured limits, leading to out-of-memory (OOM) conditions. For the blocking STOMP protocol, it causes abnormal transport exception handling and connection closure. The vulnerability affects Apache ActiveMQ versions before 5.19.8 and from 6.0.0 before 6.2.7. The issue is fixed in versions 5.19.8 and 6.2.7.
Potential Impact
The vulnerability allows remote unauthenticated attackers to cause denial-of-service by exhausting memory resources or forcing connection closures via malformed STOMP protocol messages. There is no impact on confidentiality or integrity reported. The CVSS v3.1 base score is 7.5 (high), reflecting network attack vector, low attack complexity, no privileges required, no user interaction, and impact limited to availability.
Mitigation Recommendations
A fix is available. Users should upgrade Apache ActiveMQ to version 5.19.8 or 6.2.7 or later to remediate this vulnerability. No other mitigations are indicated by the vendor advisory.
CVE-2026-49432: CWE-20 Improper Input Validation in Apache Software Foundation Apache ActiveMQ
Description
Improper Input Validation vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp. A remote unauthenticated peer that can reach an exposed STOMP connector can trigger denial-of-service behavior by sending a negative content-length. For the NIO STOMP transport, an attacker can keep streaming body bytes and grow the per-connection command buffer beyond configured limits to cause OOM. For the blocking STOMP protocol, an error will instead force abnormal transport exception handling for the affected connection and closure. This issue affects Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ Stomp: before 5.19.8, from 6.0.0 before 6.2.7. Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.
CVSS v3.1
Score 7.5high
Affected software
pkg:maven/Apache Software Foundation/org.apache.activemq:apache-activemqpkg:maven/Apache Software Foundation/org.apache.activemq:activemq-allpkg:maven/Apache Software Foundation/org.apache.activemq:activemq-stompRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-49432 is an improper input validation vulnerability (CWE-20) in Apache ActiveMQ's STOMP connector. A remote unauthenticated attacker can send a negative content-length value to trigger denial-of-service conditions. For the NIO STOMP transport, this can cause the per-connection command buffer to grow beyond configured limits, leading to out-of-memory (OOM) conditions. For the blocking STOMP protocol, it causes abnormal transport exception handling and connection closure. The vulnerability affects Apache ActiveMQ versions before 5.19.8 and from 6.0.0 before 6.2.7. The issue is fixed in versions 5.19.8 and 6.2.7.
Potential Impact
The vulnerability allows remote unauthenticated attackers to cause denial-of-service by exhausting memory resources or forcing connection closures via malformed STOMP protocol messages. There is no impact on confidentiality or integrity reported. The CVSS v3.1 base score is 7.5 (high), reflecting network attack vector, low attack complexity, no privileges required, no user interaction, and impact limited to availability.
Mitigation Recommendations
A fix is available. Users should upgrade Apache ActiveMQ to version 5.19.8 or 6.2.7 or later to remediate this vulnerability. No other mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-05-29T20:35:56.881Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a439fbb27e9c797199c07be
Added to database: 06/30/2026, 10:51:39 UTC
Last enriched: 07/07/2026, 11:56:04 UTC
Last updated: 08/14/2026, 00:41:13 UTC
Views: 64
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