Flatpak: flatpak: buffer overflow in oci delta stream path names on 32-bit systems
Published Sep 27, 2026
7.5
HIGHCVSS 3.1
EPSS 0.60%
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.
Affected products
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||
|---|---|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | affected |
| |||
| Red Hat | Red Hat Enterprise Linux 7 | affected |
| |||
| Red Hat | Red Hat Enterprise Linux 8 | affected |
| |||
| Red Hat | Red Hat Enterprise Linux 9 | affected |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Only install applications from trusted OCI registries. Flatpak remotes using the default OSTree transport are not affected.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Sep 29, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Not enough EPSS history yet for a chart. At least two recorded scores are needed.
Percentile over time
Not enough EPSS history yet for a chart. At least two recorded scores are needed.
References (3)
- https://access.redhat.com/security/cve/CVE-2026-96280 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2539419 issue-trackingx_refsource_REDHAT
- https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-96280 | vdb-entryx_refsource_REDHAT | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2539419 | issue-trackingx_refsource_REDHAT | |
| https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc |
Change history (0)
No recorded changes yet.