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Vulnerability record · CVE-2026-86320 · published 17 September 2026

CVE-2026-86320: Code injection vulnerability

A flaw was found in flatpak-builder where Git hooks are not disabled when applying patch sources with use-git-am: true. An attacker who can provide a malicious source containing a Git post-applypatch hook can cause the hook to execute on the host during the build process, resulting in arbitrary code execution with the privileges of the user running flatpak-builder.

7.8 CVSS 3.1 High EPSS 0.22% · top 88.6% CWE-94 · Code injection Awaiting Analysis
7.8CVSS 3.1 base score
0.22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
18 Sep 2026Last modified by NVD

Description

A flaw was found in flatpak-builder where Git hooks are not disabled when applying patch sources with use-git-am: true. An attacker who can provide a malicious source containing a Git post-applypatch hook can cause the hook to execute on the host during the build process, resulting in arbitrary code execution with the privileges of the user running flatpak-builder.

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

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-86320
https://bugzilla.redhat.com/show_bug.cgi?id=2471023
https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv
https://bugzilla.redhat.com/show_bug.cgi?id=2471023
https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv

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Source: NIST National Vulnerability Database (record CVE-2026-86320), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.