CVE-2026-77059 (GCVE-0-2026-77059)
Vulnerability from cvelistv5 – Published: 2026-10-26 14:46 – Updated: 2026-10-26 15:35 X_Open Source
VLAI
EPSS
VEX
Title
TOCTOU Race Condition in boneIO
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 15:30 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/10/CVE-2026-77052 | third-party-advisory |
| https://boneio.eu/en/docs/black | product |
Impacted products
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