CVE catalog
CVE-2026-76925
A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race condition exists in the `org.freedesktop.Flatpak.SystemHelper` component. This vulnerability occurs because a privileged `chmo
- Severity
- Medium · CVSS 5.8
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.10% · Oct 25, 2026
A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race condition exists in the `org.freedesktop.Flatpak.SystemHelper` component. This vulnerability occurs because a privileged `chmod` operation executes before the OSTree repository validation within the `Deploy()` function. An attacker can exploit this timing window to redirect symlinks to arbitrary files, potentially leading to unauthorized file manipulation or information disclosure.
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 | not affected |
| Debian | flatpak | forky | 1.18.4-1 | not affected |
| Debian | flatpak | trixie | 1.16.6-1~deb13u2 | not affected |
| Debian | flatpak | trixie-security | 1.16.6-1~deb13u3 | not affected |
| Debian | flatpak | bookworm | 1.14.10-1~deb12u2 | not affected |
| Debian | flatpak | bookworm-security | 1.14.10-1~deb12u2 | not affected |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | flatpak | source | sid | Not affected | unimportant | Not reported | Not reported |
| Debian | flatpak | source | forky | Not affected | unimportant | Not reported | Not reported |
| Debian | flatpak | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | flatpak | source | bookworm | Not affected | unimportant | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [flatpak]Not affected
Details (6)
1.14.10-1~deb12u2· amd64 · bookwormNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· arm64 · bookwormNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· amd64 · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· arm64 · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
- [flatpak-tests]Not affected
Source package: [flatpak]
Details (6)
1.14.10-1~deb12u2· amd64 · bookwormNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· arm64 · bookwormNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· amd64 · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· arm64 · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
- [gir1.2-flatpak-1.0]Not affected
Source package: [flatpak]
Details (6)
1.14.10-1~deb12u2· amd64 · bookwormNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· arm64 · bookwormNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· amd64 · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· arm64 · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
- [libflatpak0]Not affected
Source package: [flatpak]
Details (6)
1.14.10-1~deb12u2· amd64 · bookwormNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· arm64 · bookwormNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· amd64 · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· arm64 · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
- [libflatpak-dev]Not affected
Source package: [flatpak]
Details (6)
1.14.10-1~deb12u2· amd64 · bookwormNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· arm64 · bookwormNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· amd64 · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· arm64 · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
- [libflatpak-doc]Not affected
Source package: [flatpak]
Details (6)
1.14.10-1~deb12u2· all · bookwormNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· all · bookwormNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· all · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.16.6-1~deb13u1~bpo12+1· all · bookworm-backportsNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· all · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
1.14.10-1~deb12u2· all · bookworm-securityNot affected
nvd · flatpak · debian · bookworm
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-76925]
- [https://security-tracker.debian.org/tracker/CVE-2026-76925]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76925.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]