CVE-2026-40556: Insecure Directory Permissions in GNU nano Leading to Privilege Abuse
CSIRTS triage
- What
- Insecure directory permissions in GNU nano allow privilege abuse.
- Who is affected
- Installations of GNU nano with the vulnerable directory permission configuration are affected.
- Urgency
- Remediation timing depends on deployment context; severity is unknown and requires investigation of exposure.
- Action
- Upgrade GNU nano to a patched version with corrected directory permissions or manually fix permissions on affected installations.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch nano
Get an email when a new nano advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40556
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-40556 | coverage & exploitation status | NVD · CVE.org |
More from Microsoft Security Response Center
- lowCVE-2026-14673: PostgreSQL amcheck does not clear untrusted search path2026-08-11
- criticalCVE-2026-69836: Microsoft Entra ID Remote Code Execution Vulnerability2026-08-11
- mediumCVE-2026-53792: rsync < 3.5.0 Out-of-Bounds Read via Zero-Length Checksum Block2026-08-11
- highCVE-2026-70347: Windows Installer Elevation of Privilege Vulnerability2026-08-11
- highCVE-2026-64909: Microsoft Office Remote Code Execution Vulnerability2026-08-11