EUVD-2026-26053CVSS VectorNVD
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionNVD
GNU nano creates the user’s ~/.local directory with overly permissive permissions when the directory does not exist yet. On first use of features requiring Cross-Desktop Group (XDG) data storage, nano explicitly requests directory mode 0777, making the directory world‑writable in environments where the process umask does not sufficiently restrict permissions. In systems with a relaxed or zero umask, such as container environments, CI/CD runners, embedded systems, or user shells configured with umask 000, this results in ~/.local being created as world‑writable. A local attacker can exploit a race window between nano’s creation of ~/.local and its subsequent creation of more restrictive subdirectories to write attacker‑controlled files into the victim’s XDG directory hierarchy.
This problem was fixed in nano version 9.0
AnalysisAI
GNU nano creates the ~/.local directory with world-writable permissions (0777) on first use of XDG data storage features when the directory does not exist, allowing local attackers in systems with relaxed umasks (such as containers, CI/CD runners, or environments with umask 000) to write attacker-controlled files into the victim's XDG directory hierarchy via a race condition. The vulnerability affects nano versions before 9.0 and carries a CVSS score of 2.1 with CISA SSVC assessment indicating partial technical impact but no known public exploitation.
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