{"id":"CVE-2026-96280","title":"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, …","summary":"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, …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-197"],"vendor":"Red Hat","product":"flatpak","affected":["flatpak (all versions)","flatpak (all versions)","flatpak (all versions)","flatpak (all versions)"],"published":"2026-09-27","updated":"2026-09-27","sourceUpdated":"2026-09-27T21:17:04.200","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-96280","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-96280","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539419","label":"secalert@redhat.com"},{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc","label":"secalert@redhat.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-27T20:58:01.543Z","slug":"CVE-2026-96280","body":"## Overview\n\nThe 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":211695,"id":"CVE-2026-96280","ts":1790546354282,"field":"cvss","old":null,"new":"7.5"},{"seq":211694,"id":"CVE-2026-96280","ts":1790546354282,"field":"severity","old":"none","new":"high"}]}