{"id":"CVE-2026-96280","published":"2026-09-27T21:17:04.200","lastModified":"2026-09-29T21:29:07.663","description":"The OCI delta stream parser read sizes as guint64 but passed them to GLib I/O and allocation functions expecting gsize (32 bits on 32-bit systems), causing undersized allocations while subsequent operations use the original 64-bit size, leading to heap buffer overflows. An attacker controlling an OCI registry can craft a delta stream that triggers this during flatpak install/update, potentially achieving code execution on 32-bit systems.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cwes":["CWE-197"],"vendors":[],"products":[],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-96280","tags":[]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539419","tags":[]},{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc","tags":[]}],"exploitRefs":[{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc","tags":[]}],"hasPoc":true,"ai":null}