{"id":"CVE-2026-86320","title":"A flaw was found in flatpak-builder where Git hooks are not disabled when applying patch sources with use-git-am: true","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-94"],"vendor":"Red Hat","product":"flatpak-builder","affected":["flatpak-builder (all versions)","flatpak-builder (all versions)","flatpak-builder (all versions)"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:06:08.407","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86320","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-86320","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2471023","label":"secalert@redhat.com"},{"url":"https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2471023","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86320.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-86320"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86320"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00218,"epssPercentile":0.12527,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-17T15:42:59.014535Z"},"ingestedAt":"2026-09-17T08:14:19.086Z","slug":"CVE-2026-86320","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86320.json)","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":206267,"id":"CVE-2026-86320","ts":1789662165353,"field":"exploit_available","old":"false","new":"true"}]}