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OpenAdvisories
Medium · 5.9 Public exploit CVE-2026-122056 EUVD-2026-120416GHSA-qvvp-v7hp-wr62

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

Published Nov 9, 2026 · Updated Nov 13, 2026 · Assigned by redhat

Vendor: Red Hat Product: Red Hat Enterprise Linux 10 Product: Red Hat Enterprise Linux 6 Product: Red Hat Enterprise Linux 7 Product: Red Hat Enterprise Linux 8 Product: Red Hat Enterprise Linux 9 Product: Red Hat Hardened Images Package: openscap Package: openscap Package: openscap Platform: Linux Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

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).

Affected products

VendorProductAffectedFixed
Red Hat Red Hat Enterprise Linux 10 — —
Red Hat Red Hat Enterprise Linux 6 — —
Red Hat Red Hat Enterprise Linux 7 — —
Red Hat Red Hat Enterprise Linux 8 — —
Red Hat Red Hat Enterprise Linux 9 — —
Red Hat Red Hat Hardened Images — —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 openscap No fix yet —
Debian 13 openscap No fix yet —
Debian 12 openscap No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 26.10 openscap No fix yet —
Ubuntu 26.04 LTS openscap No fix yet —
Ubuntu 24.04 LTS openscap No fix yet —
Ubuntu 22.04 LTS openscap No fix yet —
Ubuntu 20.04 LTS openscap No fix yet —
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 18.04 LTS openscap No fix yet —
Ubuntu Pro 16.04 LTS openscap No fix yet —

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 openscap No fix yet —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • D7EAD/CVE-2026-122056 ★ 1 · Nov 9, 2026

    A flaw was found in OpenSCAP. A heap-based buffer overflow can occur when processing a specially crafted XCCDF document.

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References