Low (3.8) in golang go. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in stdlib 1.23.9, 1.24.3.
It was possible to improperly access the parent directory of an os.Root by opening a filename ending in "../". For example, Root.Open("../") would open the parent directory of the Root. This escape only permits opening the parent directory itself, not ancestors of the parent or files contained within the parent.
Severity
CVSS 3.1
3.8 low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
EPSS
0.2% chance of exploitation in the next 30 days; higher than 14% of CVEs (scores of 2026-10-31)