CVE-2026-101003
Description
A flaw was found in Mongoose. A remote attacker can trigger a stack-based buffer overflow by sending specially crafted network messages to the MQTT broker component. This flaw could lead to a Denial of Service (DoS) condition by crashing the application.
Statement
This vulnerability is evaluated as having Moderate impact for Red Hat because, although triggered remotely over network inputs without authentication, the scope of impact is limited to a denial of service crash and targets demonstration code rather than core platform functionality. The flawed broker logic resides within upstream tutorial files that are not deployed or enabled in supported Red Hat products. Any potential risk is confined to specialized community builds where this standalone server example is explicitly compiled and exposed to untrusted traffic.
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
