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9.8

Stomper messaging server can crash from crafted client messages

CVE-2026-26448 · published 8 days ago
Summary

If a client sends several connection requests over the same network link and later another client tries to send messages to a destination that was previously set up, the server may try to use memory that has already been released, causing it to stop working. This can happen because the protocol does not require authentication for those steps. Update the server to a patched version or apply the vendor's recommended configuration changes to prevent the crash.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
Ecosystem VendorProductAffected versions
Ubuntu:16.04:LTS canonical stomper All versions
Ubuntu:18.04:LTS canonical stomper All versions
Ubuntu:20.04:LTS canonical stomper All versions
Ubuntu:22.04:LTS canonical stomper All versions
Ubuntu:24.04:LTS canonical stomper All versions
Ubuntu:26.04:LTS canonical stomper All versions
Original advisory text
Stomper 5e2741e is vulnerable to Use-After-Free. When a client sends multiple CONNECT frames on the same TCP connection, and subsequently another client (or a later connection) sends SEND frames to...
Stomper 5e2741e is vulnerable to Use-After-Free. When a client sends multiple CONNECT frames on the same TCP connection, and subsequently another client (or a later connection) sends SEND frames to a destination previously subscribed on that connection, the broker may dereference a pointer to a StompStreamSocket object that has already been freed. This results in a heap use-after-free and process crash. Because the protocol does not authenticate or restrict such sequences by default.
References
Severity
9.8 Critical
CVSS 3.1: 9.8 (OSV)
Exploitation
EPSS <1%
Type
CWE-416Use After Free
Timeline
Published26 Aug 2026
Updated2 Sep 2026
First seen26 Aug 2026
Sources
CVE-2026-26448 · NVD
CVE-2026-26448 · MITRE
UBUNTU-CVE-2026-26448 · OSV
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