CVE-2026-86320 Flatpak-builder - Command Injection

Flatpak-builder contains a command injection caused by execution of Git post-applypatch hooks when applying patch sources with use-git-am: true, letting attackers execute arbitrary code with user privileges during build process, exploit requires attacker to provide malicious source.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.22% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Command Injection
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026
Weakness
CWE-94

Vendor fix

Update to the latest version where Git hooks are properly disabled during patch application.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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