CVE-2026-86320

Flatpak-builder: host code execution via `git am` hook execution in patch source extraction (`use-git-am`)

State: Published
Severity: 7.8 High
Published: Sep 17, 2026
Updated: Oct 28, 2026
Reserved: Sep 7, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	redhat

Weaknesses

CWE-94 Improper Control of Generation of Code ('Code Injection')

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:1.4.4-1.el10_2.1 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:1.4.4-1.el10_0.1 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:1.2.3-2.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:1.0.9-4.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:1.0.9-4.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:1.0.14-3.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:1.0.14-3.el8_8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.2.3-1.el9_8.1 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:1.2.2-2.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:1.2.3-2.el9_4 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:1.2.3-1.el9_6.1 and laterNot affected

References

RHSA-2026:80495vendor-advisory
RHSA-2026:80496vendor-advisory
RHSA-2026:80973vendor-advisory
RHSA-2026:84832vendor-advisory
RHSA-2026:84833vendor-advisory
RHSA-2026:84834vendor-advisory
RHSA-2026:84842vendor-advisory
RHSA-2026:86714vendor-advisory
RHSA-2026:90896vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-86320vdb-entry
RHBZ#2471023issue-tracking
https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.