CVE-2026-77059
TOCTOU Race Condition in boneIO
- State
- Published
- Severity
- 8.8 High
- Published
- Oct 26, 2026
- Updated
- Oct 26, 2026
- Reserved
- Aug 20, 2026
Description
boneIO Black contains a TOCTOU race condition in the create_timedatectl_sudoers_file() function in boneio/webui/routes/timezone_sudoers.py. The function writes sudoers rules to a predictable temporary file, validates them, then installs them with root privileges. A local attacker can exploit the race window between validation and installation to substitute malicious content, or use the predictable filename for symlink attacks, resulting in arbitrary sudoers rule injection and local privilege escalation to root.
This issue was fixed in version 1.6.0.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.8 High | CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | CERT-PL |
Weaknesses
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Products
| Product | Versions |
|---|---|
boneIOboneIO |
|
References
- https://cert.pl/en/posts/2026/10/CVE-2026-77052third-party-advisory
- https://boneio.eu/en/docs/blackproduct
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