SB2026030915 - Arbitrary file overwrite via hardlinks in node-tar
Published: March 9, 2026 Updated: March 13, 2026
Security Bulletin ID
SB2026030915
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Link following (CVE-ID: CVE-2026-29786)
CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/U:Amber
The vulnerability allows a remote attacker to overwrite arbitrary files on the system.
The vulnerability exists due to insecure handling of hard links inside archives. A remote attacker can supply a specially crafted archive to the application that can overwrite arbitrary files on the system with privileges of the process performing data extraction.
Remediation
Install update from vendor's website.