CVE-2026-77059 TOCTOU Race Condition in boneIO
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-77059?
CVE-2026-77059 is a high-severity vulnerability in boneIO, published on 26 Oct 2026.
Official 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.
Weakness: CWE-367
Which versions are affected by CVE-2026-77059?
How do I fix CVE-2026-77059?
No fix has been published for CVE-2026-77059 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-77059 being exploited?
There is no known exploitation of CVE-2026-77059 in the wild and no public exploit code.
Sources
Also known as GHSA-69w9-6j7r-c8fv.