flatpak-builder security update (CVE-2026-86320)
Flatpak-builder is a tool for building flatpaks from sources. Security Fix(es): 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.(CVE-2026-86320)
AI Analysis
Technical Summary
CVE-2026-86320 describes a flaw in flatpak-builder where Git hooks are not disabled when applying patch sources with the use-git-am option set to true. An attacker capable of supplying a malicious source containing a Git post-applypatch hook can trigger execution of this hook on the host during the build process. This results in arbitrary code execution with the privileges of the user running flatpak-builder.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code on the host system with the privileges of the user running flatpak-builder. This can lead to full compromise of the user's environment and potentially further system compromise depending on user privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid using untrusted patch sources with use-git-am set to true in flatpak-builder.
flatpak-builder security update (CVE-2026-86320)
Description
Flatpak-builder is a tool for building flatpaks from sources. Security Fix(es): 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.(CVE-2026-86320)
CVSS v3.1
Score 7.8high
Affected software
pkg:deb/ubuntu/flatpak-builder?arch=source&distro=bionicpkg:deb/ubuntu/flatpak-builder?arch=source&distro=focalpkg:deb/ubuntu/flatpak-builder?arch=source&distro=jammypkg:deb/ubuntu/flatpak-builder?arch=source&distro=noblepkg:deb/ubuntu/flatpak-builder?arch=source&distro=resolutepkg:rpm/openEuler/flatpak-builder&distro=openEuler-22.03-LTS-SP4Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86320 describes a flaw in flatpak-builder where Git hooks are not disabled when applying patch sources with the use-git-am option set to true. An attacker capable of supplying a malicious source containing a Git post-applypatch hook can trigger execution of this hook on the host during the build process. This results in arbitrary code execution with the privileges of the user running flatpak-builder.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code on the host system with the privileges of the user running flatpak-builder. This can lead to full compromise of the user's environment and potentially further system compromise depending on user privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid using untrusted patch sources with use-git-am set to true in flatpak-builder.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-86320
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab4be45f7a7c54106f047ea
Added to database: 09/24/2026, 06:08:05 UTC
Last enriched: 09/24/2026, 06:41:44 UTC
Last updated: 09/25/2026, 04:50:06 UTC
Views: 4
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