CVE-2025-12771 IBM Concert Software Improper Restriction of Operations within the Bounds of a Memory Buffer.

High 7.8 Published 26 Dec 2025 Updated 26 Feb 2026

A local user can exploit a stack-based buffer overflow in IBM Concert to execute arbitrary code on the system.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-12771?

CVE-2025-12771 is a high-severity memory corruption vulnerability in Ibm Concert, published on 26 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

IBM Concert 1.0.0 through 2.1.0 is vulnerable to a stack-based buffer overflow, caused by improper bounds checking. A local user could overflow the buffer and execute arbitrary code on the system.

Weakness: CWE-119

Which versions are affected by CVE-2025-12771?

It affects 1 product.

Products include Ibm Concert.

How do I fix CVE-2025-12771?

No fix has been published for CVE-2025-12771 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-12771 being exploited?

There is no known exploitation of CVE-2025-12771 in the wild and no public exploit code.

All Ibm Concert vulnerabilities

Sources

Also known as GHSA-737v-mrx7-86p3.