CVE-2026-49432

HIGH

Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp: STOMP negative content-length enables denial of service

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-49432. PoCs published by HermesNA-1.

AI-analyzed exploit summary This repository contains an auto-generated stub module for CVE-2026-49432, an improper input validation vulnerability in Apache ActiveMQ's STOMP connector. The code includes placeholder methods (`check()` and `run()`) but lacks actual exploit logic, referencing external advisories for details.

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.

Exploits (1)

github STUB 1 stars
by HermesNA-1 · pythonpoc
https://github.com/HermesNA-1/SnakeSploit/tree/main/data/modules_generated/cve-2026-49432_improper_input_validation.py

This repository contains an auto-generated stub module for CVE-2026-49432, an improper input validation vulnerability in Apache ActiveMQ's STOMP connector. The code includes placeholder methods (`check()` and `run()`) but lacks actual exploit logic, referencing external advisories for details.

Classification
Stub 99%
Attack Type
Dos
Complexity
Moderate
Reliability
Theoretical
Target: Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp
No auth needed
Prerequisites: Network access to an exposed STOMP connector (default port 61613)
mistral-large-3 · analyzed Jul 09, 2026 Full analysis →

References (2)

Core 2

Scores

CVSS v3 7.5
EPSS 0.0084
EPSS Percentile 53.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-20
Status published
Products (7)
apache/activemq < 5.19.8
Apache Software Foundation/Apache ActiveMQ < 5.19.8
Apache Software Foundation/Apache ActiveMQ 6.0.0 - 6.2.7
Apache Software Foundation/Apache ActiveMQ All < 5.19.8
Apache Software Foundation/Apache ActiveMQ All 6.0.0 - 6.2.7
Apache Software Foundation/Apache ActiveMQ Stomp < 5.19.8
Apache Software Foundation/Apache ActiveMQ Stomp 6.0.0 - 6.2.7
Published Jun 30, 2026
Tracked Since Jun 30, 2026