CVE-2026-122056 Openscap: one-byte heap buffer overflow in sds-compose may lead to denial-of-service

Medium 5.9 Published 9 Nov 2026 Updated 11 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-122056?

CVE-2026-122056 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 9 Nov 2026.

Official description

A flaw was found in OpenSCAP. A heap-based buffer overflow can occur when processing a specially crafted Extensible Configuration Checklist Description Format (XCCDF) document using the sds-compose option. An attacker could exploit this vulnerability to corrupt memory, resulting in an application crash and a Denial of Service (DoS).

Weakness: CWE-787

Which versions are affected by CVE-2026-122056?

How do I fix CVE-2026-122056?

No fix has been published for CVE-2026-122056 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-122056 being exploited?

There is no known exploitation of CVE-2026-122056 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Sources

Also known as DEBIAN-CVE-2026-122056, ECHO-82e5-517a-1652, GHSA-qvvp-v7hp-wr62, UBUNTU-CVE-2026-122056.