# CVE-2026-92822: Libmodulemd: libmodulemd: unbounded recursion when parsing nested xmd yaml

Status: published. Published: 2026-10-21. Updated: 2026-11-06.

A flaw was found in libmodulemd. When parsing module metadata, the xmd field is converted into nested GVariant values through recursive YAML mapping and sequence helpers without a recursion-depth or node-count limit. An attacker who can supply crafted modulemd YAML with deeply nested xmd content can cause stack exhaustion or excessive resource consumption, resulting in a denial of service.

## Remediation

- workaround: Avoid parsing untrusted modulemd documents that may contain attacker-controlled xmd data. If such input must be accepted, reject unusually deep or large xmd structures before handing them to libmodulemd, and isolate parsing in a process with strict stack, CPU, and memory limits. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (libmodulemd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (libmodulemd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (libmodulemd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Hardened Images (libmodulemd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-8): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 5 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.2 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.21% as of 2026-11-05; percentile 11.73%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-674

## Exploit evidence

- exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2479002 (ADP: CISA-ADP)

## References

- https://access.redhat.com/security/cve/CVE-2026-92822 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479002 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://github.com/advisories/GHSA-85r9-7wj5-x6x5 (CNA: redhat)

- https://github.com/fedora-modularity/libmodulemd/pull/645 (CNA: redhat)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479002 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-92822; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-92822; retrieved 2026-11-06; source updated Not reported

Revision: 8846006e5e94ddfac5b73baf5d19b471f5083eb9ef6a472b70aa24f7f197574a

Canonical: https://y2.dev/cve/CVE-2026-92822

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