SB2026030634 - Security restriction bypass in OpenBSD unveil(2)
Published: March 6, 2026
Security Bulletin ID
SB2026030634
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Path traversal (CVE-ID: N/A)
CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to input validation error in sys/kern/vfs_lookup.c of unveil(2). A local user can bypass mountpoints restrictions and gain unauthorized access to the system.
Remediation
Install update from vendor's website.