CVE-2026-96276

CRITICAL 9.8

Flatpak: flatpak: arbitrary write in host context via flatpak build-init

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	red hat
Product	red hat enterprise linux 10
Published	Sep 23, 2026
Last Updated	Sep 23, 2026

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Affected Versions

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 7

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-96276 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2539418 github.com: https://github.com/flatpak/flatpak/security/advisories/GHSA-8qxj-x646-phcm

Credits

Upstream acknowledges Sebastian Wick as the original reporter.