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Fencer Intel
medium 5.9

CVE-2026-122056 json

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

published 2d ago modified 13h ago also EUVD-2026-120416 , GHSA-5h6x-q65w-wxvf

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository OpenSCAP/openscap. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

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).

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-122056 updated cvss 5.9

openscap: One-byte heap buffer overflow in sds-compose may lead to Denial-of-Service

  • Red Hat Enterprise Linux 6 openscap, openscap-perl, openscap-utils, openscap-python, openscap-content, openscap-scanner, +2 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 openscap, openscap-utils, openscap-python, openscap-scanner, openscap-selinux, openscap-containers, +2 more Red Hat Enterprise Linux 8 openscap, openscap-utils, openscap-python3, openscap-scanner, openscap-engine-sce Red Hat Enterprise Linux 9 openscap, openscap-utils, openscap-python3, openscap-scanner, openscap-engine-sce Red Hat Enterprise Linux 10 openscap
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images openscap
    affected: workaround, no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H

Affected products

  • 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

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of OpenSCAP/openscap published their own advisory on GitHub. Reviewed sources take precedence over it.