This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-96280 →

UBUNTU-CVE-2026-96280

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), ca...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV