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Vulnerability record · CVE-2026-96276 · published 23 September 2026

CVE-2026-96276: Path traversal vulnerability

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.

6.5 CVSS 3.1 Medium EPSS 0.46% · top 62.5% CWE-22 · Path traversal Awaiting Analysis
6.5CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
27 Sep 2026Last modified by 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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-96276), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.