Quick answers
- Is CVE-2026-96280 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-96280 being exploited in the wild.
- How severe is CVE-2026-96280?
- High severity, with a CVSS score of 7.5, published 27 September 2026.
- Which products and versions are affected?
- Flatpak Flatpak.
- Is there a fix for CVE-2026-96280?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-96280 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-96280?
- Check whether you run Flatpak. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a numeric truncation error (CWE-197) where the OCI delta stream parser reads allocation sizes as guint64 (64-bit) but passes them to GLib functions expecting gsize (32-bit on 32-bit systems), resulting in undersized heap allocations. Subsequent operations then use the original 64-bit size values, causing heap buffer overflow. The attack vector is network-based with high attack complexity due to platform-specific exploitation (32-bit only) and required user interaction to install/update applications.
Affected products
- Flatpak Flatpak
Timeline
- 2026-09-27: disclosed