CVE catalog
CVE-2021-26910
firejail: CVE-2021-26910
- Severity
- High · CVSS 7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.44% · Oct 27, 2026
Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU race condition between a stat operation and an OverlayFS mount operation.
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 | firejail | sid | 0.9.80-2 | fixed |
| Debian | firejail | trixie | 0.9.74-1 | fixed |
| Debian | firejail | bookworm | 0.9.72-2 | fixed |
| Ubuntu | firejail | 20.04 | 0.9.60-2 | vulnerable |
| Ubuntu | firejail | 20.04 | 0.9.62-1 | vulnerable |
| Ubuntu | firejail | 20.04 | 0.9.62-2 | vulnerable |
| Ubuntu | firejail | 20.04 | 0.9.62-3 | vulnerable |
| Ubuntu | firejail | 20.04 | 0.9.62-3ubuntu0.1 | fixed |
| Ubuntu | firejail | 16.04 | 0.9.28-1 | vulnerable |
| Ubuntu | firejail | 16.04 | 0.9.32-1 | vulnerable |
| Ubuntu | firejail | 16.04 | 0.9.34-1 | vulnerable |
| Ubuntu | firejail | 16.04 | 0.9.36-1 | vulnerable |
| Ubuntu | firejail | 16.04 | 0.9.38-1 | vulnerable |
| Ubuntu | firejail | 16.04 | 0.9.38-1ubuntu0.1 | vulnerable |
| Ubuntu | firejail | 16.04 | 0.9.38.10-0ubuntu0.16.04.1 | vulnerable |
| Ubuntu | firejail | 18.04 | 0.9.50-3 | vulnerable |
| Ubuntu | firejail | 18.04 | 0.9.52-1 | vulnerable |
| Ubuntu | firejail | 18.04 | 0.9.52-2 | vulnerable |
| Ubuntu | firejail | 20.04 | 0.9.60-2 | vulnerable |
| Ubuntu | firejail | 20.04 | 0.9.62-1 | vulnerable |
| Ubuntu | firejail | 20.04 | 0.9.62-2 | vulnerable |
| Ubuntu | firejail | 20.04 | 0.9.62-3 | vulnerable |
| Ubuntu | firejail | 20.04 | 0.9.62-3ubuntu0.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | firejail | source | sid | 0.9.64.4-1 | not yet assigned | Not reported | Not reported |
| Debian | firejail | source | trixie | 0.9.64.4-1 | not yet assigned | Not reported | Not reported |
| Debian | firejail | source | bookworm | 0.9.64.4-1 | not yet assigned | Not reported | Not reported |
| Ubuntu | firejail | deb | 20.04 | 0.9.62-3ubuntu0.1 | Not reported | USN-5141-1 | Not reported |
| Ubuntu | firejail | deb | 20.04 | 0.9.62-3ubuntu0.1 | Not reported | UBUNTU-CVE-2021-26910 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [firejail]Fixed
Details (2)
0.9.72-2· amd64 · bookwormFixed · Fixed:
0.9.64.4-1dsa · firejail · debian · bookworm; dsa · firejail · debian · 12
0.9.72-2· arm64 · bookwormFixed · Fixed:
0.9.64.4-1dsa · firejail · debian · bookworm; dsa · firejail · debian · 12
- [firejail-profiles]Fixed
Source package: [firejail]
Details (2)
0.9.72-2· all · bookwormFixed · Fixed:
0.9.64.4-1dsa · firejail · debian · bookworm; dsa · firejail · debian · 12
0.9.72-2· all · bookwormFixed · Fixed:
0.9.64.4-1dsa · firejail · debian · bookworm; dsa · firejail · debian · 12
[Debian 13 (Trixie)]
- [firejail]Fixed
Details (2)
0.9.74-1· amd64 · trixieFixed · Fixed:
0.9.64.4-1dsa · firejail · debian · 13
0.9.74-1· arm64 · trixieFixed · Fixed:
0.9.64.4-1dsa · firejail · debian · 13
- [firejail-profiles]Fixed
Source package: [firejail]
Details (2)
0.9.74-1· all · trixieFixed · Fixed:
0.9.64.4-1dsa · firejail · debian · 13
0.9.74-1· all · trixieFixed · Fixed:
0.9.64.4-1dsa · firejail · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2021_0271-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-26910]
- [https://osv.dev/vulnerability/DLA-2554-1]
- [https://osv.dev/vulnerability/DSA-4849-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-26910]
- [https://osv.dev/vulnerability/USN-5141-1]
- [https://security-tracker.debian.org/tracker/CVE-2021-26910]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-26910.json]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]