Race condition in node-tar - CVE-2026-23950
Published: January 20, 2026
Vulnerability identifier: #VU121671
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:P/U:Green
CVE-ID: CVE-2026-23950
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: isaacs
Affected software:
node-tar
node-tar
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to a race condition in Path Reservations via Unicode Sharp-S (ß) Collisions on macOS APFS. A remote attacker can trick the victim into using a specially crafted archive to bypass the library's internal concurrency safeguards and perform Symlink Poisoning attacks.
How to mitigate CVE-2026-23950
Install updates from vendor's website.