High [CVE-2026-26447] Denial of Service via Use-After-Free vulnerability
This high-severity Red Hat Linux advisory covers CVE-2026-26447.
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Summary
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.
A flaw was found in Stomper. This leads to incorrect cleanup of internal subscription structures, resulting in a heap use-after-free during StompClient destruction.
Successful exploitation causes the broker process to crash, leading to a denial of service. A remote, unauthenticated attacker can exploit this by repeatedly issuing SUBSCRIBE commands for the same destination over a single connection and subsequently closing the connection.
RHEL default security controls like address space layout randomization (ASLR) and process isolation limit this impact to a Denial of Service against the broker process, without granting arbitrary code execution. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-825.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 52 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 52 minutes ago·verify at source
Mitigation checklist
- Limit exposure by restricting access to the STOMP endpoint using network firewalls or security group rules to allow only trusted clients. Where supported by the infrastructure layer, enforce connection rate limiting or per-IP subscription caps to mitigate repeated socket connection-closing cycles.
Official advisory · high-confidence parse· fetched 52 minutes ago·verify at source
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