Vulnerability · Published Aug 26, 2026 · Assigned by mitre
CVE-2026-26448
Critical 9.8
In plain English
A critical-severity use-after-free in the stomper package (Ubuntu). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | stomper | no fix listed | UBUNTU-CVE-2026-26448 |
| Ubuntu:24.04:LTS | stomper | no fix listed | UBUNTU-CVE-2026-26448 |
| Ubuntu:26.04:LTS | stomper | no fix listed | UBUNTU-CVE-2026-26448 |
| Ubuntu:26.10 | stomper | no fix listed | UBUNTU-CVE-2026-26448 |
Affected products (as reported)
Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H