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.
Published: 2026-09-27
Score: 7.5 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

Only install applications from trusted OCI registries. Flatpak remotes using the default OSTree transport are not affected.

Tracking

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Advisories

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History

Sun, 27 Sep 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Sun, 27 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
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.
Title Flatpak: flatpak: buffer overflow in oci delta stream path names on 32-bit systems
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-197
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References

Subscriptions

Redhat Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-27T21:00:17.108Z

Reserved: 2026-09-22T20:43:35.900Z

Link: CVE-2026-96280

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-27T21:17:04.200

Modified: 2026-09-27T21:17:04.200

Link: CVE-2026-96280

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-27T22:30:17Z

Weaknesses