CVE-2026-77059

TOCTOU Race Condition in boneIO

Published Oct 26, 2026 CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title TOCTOU Race Condition in boneIO
First Time appeared Boneio
Boneio boneio
Weaknesses CWE-367
CPEs cpe:2.3:a:boneio:boneio:*:*:*:*:*:*:*:*
Vendors & Products Boneio
Boneio boneio
References
Metrics cvssV4_0

{'score': 8.8, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
CERT-PL
Published
Updated
Oct 26, 2026, 3:35 PM
Reserved
Aug 20, 2026, 9:37 AM
Status
Deferred
Published
Oct 26, 2026, 3:16 PM
Modified
Oct 26, 2026, 5:11 PM