Vulnerability record/PUBLISHED/Published Sep 27, 2026 20:19:12 UTC
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), 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.
Base score7.5/ 10
SeverityHighCVSS 3.1
Exploitability / impact
CVSS metric breakdown
Base severityHigh
Attack vectorNetworkAV
Attack complexityHighAC
Privileges requiredNonePR
User interactionRequiredUI
ScopeUnchangedS
Confidentiality impactHighC
Integrity impactHighI
Availability impactHighA
CVSS vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:HCVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.
Record context
CVE Numbering Authorityredhat
Last updatedOct 26, 2026 02:13:05 UTC
PublishedSep 27, 2026 20:19:12 UTC
ReservedSep 22, 2026 20:43:35 UTC
Credits
- Upstream acknowledges Sebastian Wick as the original reporter.