CVE-2026-96280
The OCI delta stream parser read sizes as guint64 but passed them to GLib I/O and allocation…
- Risk score
- 60/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.7%
- Published
- 27 Sep 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 craf…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 7.5 high
- Remotely exploitable without logging in
References
- 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/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
Original 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.
Last activity 27 Sep 2026. Patch Forecast updates every hour.