CVE catalog

CVE-2026-86320

flatpak-builder: CVE-2026-86320

Severity: High · CVSS 7.8CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: Aug 13, 2026, 2:32:20 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.29% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	flatpak-builder	sid	`1.4.12-2`	fixed
Debian	flatpak-builder	forky	`1.4.12-2`	fixed
Debian	flatpak-builder	trixie	`1.4.4-2`	vulnerable
Debian	flatpak-builder	bookworm	`1.2.3-1`	vulnerable
Opensuse	flatpak-builder	tumbleweed	`1.4.12-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	flatpak-builder	source	sid	`1.4.11-1`	not yet assigned	Not reported	[1147700]
Debian	flatpak-builder	source	forky	`1.4.11-1`	not yet assigned	Not reported	[1147700]
Debian	flatpak-builder	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1147700]
Debian	flatpak-builder	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1147700]
Opensuse	flatpak-builder	rpm	tumbleweed	`1.4.12-1.1`	Not reported	OPENSUSE-SU-2026:11845-1	Not reported

[Debian bug #1147700]

Notes

[trixie] flatpak-builder: Minor issue [bookworm] flatpak-builder: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[flatpak-builder]Affected
Details (4)
- 1.2.3-1 · amd64 · bookworm
  Affected
  dsa · flatpak-builder · debian · bookworm; dsa · flatpak-builder · debian · 12
- 1.2.3-1 · arm64 · bookworm
  Affected
  dsa · flatpak-builder · debian · bookworm; dsa · flatpak-builder · debian · 12
- 1.4.4-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · flatpak-builder · debian · bookworm; dsa · flatpak-builder · debian · 12
- 1.4.4-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · flatpak-builder · debian · bookworm; dsa · flatpak-builder · debian · 12
[flatpak-builder-tests]Affected
Source package: [flatpak-builder]
Details (4)
- 1.2.3-1 · amd64 · bookworm
  Affected
  dsa · flatpak-builder · debian · bookworm; dsa · flatpak-builder · debian · 12
- 1.2.3-1 · arm64 · bookworm
  Affected
  dsa · flatpak-builder · debian · bookworm; dsa · flatpak-builder · debian · 12
- 1.4.4-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · flatpak-builder · debian · bookworm; dsa · flatpak-builder · debian · 12
- 1.4.4-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · flatpak-builder · debian · bookworm; dsa · flatpak-builder · debian · 12

[Debian 13 (Trixie)]

[flatpak-builder]Affected
Details (2)
- 1.4.4-2 · amd64 · trixie
  Affected
  dsa · flatpak-builder · debian · 13
- 1.4.4-2 · arm64 · trixie
  Affected
  dsa · flatpak-builder · debian · 13
[flatpak-builder-tests]Affected
Source package: [flatpak-builder]
Details (2)
- 1.4.4-2 · amd64 · trixie
  Affected
  dsa · flatpak-builder · debian · 13
- 1.4.4-2 · arm64 · trixie
  Affected
  dsa · flatpak-builder · debian · 13

[openSUSE Tumbleweed]

[flatpak-builder]Affected
Source package: [flatpak-builder]
Details (1)
- 1.4.10-1.1 · x86_64 · tumbleweed
  Affected · Fixed: 1.4.12-1.1
  dsa · flatpak-builder · opensuse · tumbleweed

Observed: Oct 23, 2026, 8:59:09 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]