Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-96276
Red Hat Red Hat Enterprise Linux 10 — Flatpak: flatpak: arbitrary write in host context via flatpak build-init
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N R U N H N 6.5 .0037 28.8 —
AFFECTED
Product Versions Fixed
Red Hat Enterprise Linux 10 unspecified —
Red Hat Enterprise Linux 7 unspecified —
Red Hat Enterprise Linux 8 unspecified —
Red Hat Enterprise Linux 9 unspecified —
TIMELINE
Sep 22 Reserved by redhat
Sep 23 Published (CNA: redhat)
Sep 27 RESCORED — CVE-2026-96276 (Red Hat Enterprise Linux 10). CVSS 9.8 → 6.5 (NVD).
Description
If a malicious SDK container declares an extension point with a crafted `directory` path, and a developer runs `flatpak build-init --writable-sdk --sdk-extension` with that SDK, attacker-chosen files could be written outside the working directory, since the target path is resolved via a function that allows `..` traversal.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| September 22, 2026 | Reserved | Reserved by redhat |
| September 23, 2026 | Published | Published (CNA: redhat) |
| September 27, 2026 | RESCORED | RESCORED — CVE-2026-96276 (Red Hat Enterprise Linux 10). CVSS 9.8 → 6.5 (NVD). |
Affected
Affected products and packages — 4 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-96276 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
