CVE catalog

CVE-2026-96808

Severity: High · CVSS 7.8CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Published: Sep 23, 2026, 4:58:37 PM UTC
Updated: Sep 23, 2026, 5:17:25 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.11% · Oct 25, 2026

In Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session's directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.

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	sid	`1.18.4-1`	fixed
Debian	flatpak	forky	`1.18.4-1`	fixed
Debian	flatpak	trixie	`1.16.6-1~deb13u2`	fixed
Debian	flatpak	trixie-security	`1.16.6-1~deb13u3`	fixed
Debian	flatpak	bookworm	`1.14.10-1~deb12u2`	vulnerable
Debian	flatpak	bookworm-security	`1.14.10-1~deb12u2`	vulnerable
Ubuntu	flatpak	pro	`1.14.4-2`	vulnerable
Ubuntu	flatpak	pro	`1.14.5-1`	vulnerable
Ubuntu	flatpak	pro	`1.14.5-1build1`	vulnerable
Ubuntu	flatpak	pro	`1.14.5-1build4`	vulnerable
Ubuntu	flatpak	pro	`1.14.5-1build5`	vulnerable
Ubuntu	flatpak	pro	`1.14.5-1build6`	vulnerable
Ubuntu	flatpak	pro	`1.14.6-1`	vulnerable
Ubuntu	flatpak	pro	`1.14.6-1ubuntu0.1`	vulnerable
Ubuntu	flatpak	pro	`1.14.6-1ubuntu0.1+esm1`	vulnerable
Ubuntu	flatpak	26.04	`1.16.1-2ubuntu1`	vulnerable
Ubuntu	flatpak	26.04	`1.16.1-3ubuntu1`	vulnerable
Ubuntu	flatpak	26.04	`1.16.2-1`	vulnerable
Ubuntu	flatpak	26.04	`1.16.3-1`	vulnerable
Ubuntu	flatpak	26.04	`1.16.3-1build1`	vulnerable
Ubuntu	flatpak	26.04	`1.16.4-1`	vulnerable
Ubuntu	flatpak	26.04	`1.16.4-2`	vulnerable
Ubuntu	flatpak	26.04	`1.16.6-1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	flatpak	source	sid	`1.18.1-1`	not yet assigned	Not reported	[1144130]
Debian	flatpak	source	forky	`1.18.1-1`	not yet assigned	Not reported	[1144130]
Debian	flatpak	source	trixie	`1.16.6-1~deb13u2`	not yet assigned	Not reported	[1144130]
Debian	flatpak	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1144130]

[Debian bug #1144130]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[flatpak]Affected
Details (6)
- 1.14.10-1~deb12u2 · amd64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · amd64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
[flatpak-tests]Affected
Source package: [flatpak]
Details (6)
- 1.14.10-1~deb12u2 · amd64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · amd64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
[gir1.2-flatpak-1.0]Affected
Source package: [flatpak]
Details (6)
- 1.14.10-1~deb12u2 · amd64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · amd64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
[libflatpak0]Affected
Source package: [flatpak]
Details (6)
- 1.14.10-1~deb12u2 · amd64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · amd64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
[libflatpak-dev]Affected
Source package: [flatpak]
Details (6)
- 1.14.10-1~deb12u2 · amd64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · amd64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · arm64 · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
[libflatpak-doc]Affected
Source package: [flatpak]
Details (6)
- 1.14.10-1~deb12u2 · all · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · all · bookworm
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.16.6-1~deb13u1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · all · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12
- 1.14.10-1~deb12u2 · all · bookworm-security
  Affected
  nvd · flatpak · debian · bookworm; nvd · flatpak · debian · 12

[Debian 13 (Trixie)]

[flatpak]Affected
Details (6)
- 1.16.6-1~deb13u1 · amd64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · arm64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · arm64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
[flatpak-tests]Affected
Source package: [flatpak]
Details (6)
- 1.16.6-1~deb13u1 · amd64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · arm64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · arm64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
[gir1.2-flatpak-1.0]Affected
Source package: [flatpak]
Details (6)
- 1.16.6-1~deb13u1 · amd64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · arm64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · arm64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
[libflatpak0]Affected
Source package: [flatpak]
Details (6)
- 1.16.6-1~deb13u1 · amd64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · arm64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · arm64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
[libflatpak-dev]Affected
Source package: [flatpak]
Details (6)
- 1.16.6-1~deb13u1 · amd64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · arm64 · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · arm64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
[libflatpak-doc]Affected
Source package: [flatpak]
Details (6)
- 1.16.6-1~deb13u1 · all · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · all · trixie
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u1 · all · trixie-security · Historical version
  Affected · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · all · trixie-security · Historical version
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u2 · all · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13
- 1.16.6-1~deb13u3 · all · trixie-security
  Fixed · Fixed: 1.16.6-1~deb13u2
  nvd · flatpak · debian · 13

Observed: Oct 27, 2026, 5:43:46 AM 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]