CVE-2026-77059

UNKNOWN 0.0

TOCTOU Race Condition in boneIO

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-367
Vendor	boneio
Product	boneio
Published	Oct 26, 2026
Last Updated	Oct 26, 2026

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Affected Versions

boneIO / boneIO

1.3.0 < 1.6.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

cert.pl: https://cert.pl/en/posts/2026/10/CVE-2026-77052 boneio.eu: https://boneio.eu/en/docs/black

Credits

Mateusz Włodarczak (s3ga)