CVE-2026-96280 Flatpak: flatpak: buffer overflow in oci delta stream path names on 32-bit systems
A buffer overflow in Flatpak's OCI delta parser on 32-bit systems allows attackers to execute arbitrary code via malicious registry streams.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-96280?
CVE-2026-96280 is a high-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 27 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-197
Which versions are affected by CVE-2026-96280?
How do I fix CVE-2026-96280?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-96280 being exploited?
There is no known exploitation of CVE-2026-96280 in the wild and no public exploit code.
Sources
Also known as CLSA-2026-1792153368, CLSA-2026-1792626355, DEBIAN-CVE-2026-96280, UBUNTU-CVE-2026-96280.