Heap-based buffer overflow in Flatpak - CVE-2026-96280
Published: August 11, 2026 / Updated: September 28, 2026
Vulnerability identifier: #VU141402
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-96280
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in the OCI delta stream parser when processing a crafted delta stream from a malicious OCI registry during installation or update. A remote attacker can supply a specially crafted OCI delta stream to execute arbitrary code.
Only 32-bit systems are practically exploitable. Flatpak remotes using the default OSTree transport are not affected.
Affected software
Flatpak
How to mitigate CVE-2026-96280
Install security update from vendor's website.
Flatpak - update to 1.18.1