---
id: CVE-2026-92822
title: 'Libmodulemd: libmodulemd: unbounded recursion when parsing nested xmd yaml'
summary: >-
  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 …
severity: medium
cvss: 6.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-674
vendor: Red Hat
product: libmodulemd
affected:
  - libmodulemd (all versions)
  - libmodulemd (all versions)
  - libmodulemd (all versions)
  - libmodulemd (all versions)
  - openshift/ose-rhel-coreos-8 (all versions)
  - openshift/ose-rhel-coreos-9 (all versions)
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T03:23:10.559Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-92822'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-92822'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2479002'
    label: RHBZ#2479002
tags:
  - cve.org
ingestedAt: '2026-10-21T06:42:48.208Z'
---

## Overview

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.

## Affected

- `libmodulemd (all versions)`
- `libmodulemd (all versions)`
- `libmodulemd (all versions)`
- `libmodulemd (all versions)`
- `openshift/ose-rhel-coreos-8 (all versions)`
- `openshift/ose-rhel-coreos-9 (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

Until a fix is available, 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.