{"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":"2026-10-12","sourceUpdated":"2026-10-12T17:17:39.117","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-96280","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:80497","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:80498","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:80687","label":"secalert@redhat.com"},{"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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96280.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-96280"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96280"},{"url":"https://access.redhat.com/errata/RHSA-2026:89733","label":"RHSA-2026:89733"},{"url":"https://access.redhat.com/errata/RHSA-2026:90364","label":"RHSA-2026:90364"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00497,"epssPercentile":0.42398,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-29T15:50:48.098460Z"},"ingestedAt":"2026-09-27T20:58:01.543Z","patched":["enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_8","enterprise_linux_appstream_eus_v_9_6","enterprise_linux_appstream_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","codeready_linux_builder_eus_v_9_6","enterprise_linux_codeready_linux_builder_v_9"],"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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 7 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96280.json)\n- **RHSA-2026:80498** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:80498)\n- **RHSA-2026:80687** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:80687)\n- **RHSA-2026:89733** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-10-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:89733)\n- **RHSA-2026:80497** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:80497)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"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"}]}