CVE-2026-96280
HIGHCVSS 7.5Description
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.
Timeline
Published:September 27th, 2026 9:17 PM
Last modified:November 6th, 2026 3:16 AM
CVSS Scoring
CVSS v3: 7.5 (HIGH)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- https://access.redhat.com/errata/RHSA-2026:80497
- https://access.redhat.com/errata/RHSA-2026:80498
- https://access.redhat.com/errata/RHSA-2026:80687
- https://access.redhat.com/errata/RHSA-2026:89733
- https://access.redhat.com/errata/RHSA-2026:90364
- https://access.redhat.com/errata/RHSA-2026:92221
- https://access.redhat.com/errata/RHSA-2026:92369
- https://access.redhat.com/errata/RHSA-2026:95493
- https://access.redhat.com/security/cve/CVE-2026-96280
- https://bugzilla.redhat.com/show_bug.cgi?id=2539419
- https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc
Source: NIST NVD · Data may lag official sources by up to one minute