{"id":"CVE-2026-92823","title":"Libmodulemd: libmodulemd: missing decompressed-size limit when parsing compressed yaml","summary":"A flaw was found in libmodulemd. In builds with rpmio support enabled, compressed modulemd YAML is decompressed through a custom read handler that does not enforce a cumulative decompressed-size limit before parsing. 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-409"],"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)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-21T15:00:02.575963Z"},"published":"2026-10-21","updated":"2026-10-21","sourceUpdated":"2026-10-21T15:49:05.380Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-92823","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-92823"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2478703","label":"RHBZ#2478703"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92823.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92823"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92823"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.0016,"epssPercentile":0.05147,"ingestedAt":"2026-10-21T06:42:48.209Z","slug":"CVE-2026-92823","body":"## Overview\n\nA flaw was found in libmodulemd. In builds with rpmio support enabled, compressed modulemd YAML is decompressed through a custom read handler that does not enforce a cumulative decompressed-size limit before parsing. An attacker who can supply a highly compressible compressed YAML file can cause excessive CPU and memory consumption, resulting in a denial of service.\n\n## Affected\n\n- `libmodulemd (all versions)`\n- `libmodulemd (all versions)`\n- `libmodulemd (all versions)`\n- `libmodulemd (all versions)`\n- `openshift/ose-rhel-coreos-8 (all versions)`\n- `openshift/ose-rhel-coreos-9 (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nUntil a fix is available, avoid parsing attacker-controlled compressed module metadata in rpmio-enabled builds. Where compressed input is required, decompress outside the process under strict size quotas, or reject files whose decompressed size exceeds a conservative limit before passing data to libmodulemd. Building without rpmio support removes the affected path.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, … · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92823.json)","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":34.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}