CVE-2026-86320

CVE Details

Release Date:	2026-09-17
Impact:	Important	What is this?

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.

See more information about CVE-2026-86320 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.8
Vector String:	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	Required
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 10 (flatpak-builder)	ELSA-2026-80495	2026-10-11
Oracle Linux version 8 (flatpak-builder)	ELSA-2026-80973	2026-10-12
Oracle Linux version 9 (flatpak-builder)	ELSA-2026-80496	2026-10-11