CVE-2026-26447

Deferred Deferred - Pending Action

Use-After-Free in Stomper Broker via SUBSCRIBE Command

Publication date: 2026-08-26

Last updated on: 2026-08-27

Assigner: MITRE

Description

Stomper 5e2741e is vulnerable to Use-After-Free. When a single client repeatedly issues SUBSCRIBE commands for the same destination over one connection and then closes that connection, the broker performs incorrect cleanup of its internal subscription structures. This results in a heap use-after-free during StompClient destruction, causing the broker process to crash. An unauthenticated client can exploit this to reliably trigger a denial of service.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-26

Last Modified

2026-08-27

Generated

2026-09-16

AI Q&A

2026-08-27

EPSS Evaluated

2026-09-15

NVD

CVE-2026-26447

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This vulnerability is a Use-After-Free issue in Stomper 5e2741e. It occurs when a client repeatedly sends SUBSCRIBE commands for the same destination over one connection and then closes it. The broker fails to properly clean up internal subscription structures, leading to a heap use-after-free during StompClient destruction. This causes the broker process to crash.

Detection Guidance

Detecting this vulnerability requires monitoring for crashes in the Stomper broker process after repeated SUBSCRIBE commands. Check logs for segmentation faults or abnormal terminations. Use tools like gdb to analyze core dumps if crashes occur. Monitor network traffic for repeated SUBSCRIBE commands from the same client. No specific commands are provided for detection.

Impact Analysis

An unauthenticated attacker can exploit this to crash the broker process, resulting in a denial of service. This disrupts service availability for all clients relying on the broker.

Compliance Impact

This vulnerability causes a denial of service by crashing the broker process, which could disrupt data processing or availability. For GDPR, this may impact data integrity and availability requirements under Article 32. For HIPAA, it could affect the availability of protected health information systems.

Mitigation Strategies

Update Stomper to the latest version that fixes the use-after-free issue in subscription cleanup. If an update is not available, restrict client connections to trusted sources and monitor broker processes for crashes.

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