CVE-2026-35355

The install utility in uutils coreutils is vulnerable to a Time-of-Check to Time-of-Use (TOCTOU) race condition during file installation. The implementation unlinks an existing destination file and then recreates it using a path-based operation without the O_EXCL flag. A local attacker can exploit the window between the unlink and the subsequent creation to swap the path with a symbolic link, allowing them to redirect privileged writes to overwrite arbitrary system files.

• CWE-367

• https://github.com/uutils/coreutils/pull/10067Exploit, Issue Tracking, Patch
• https://github.com/uutils/coreutils/releases/tag/0.6.0Release Notes
• https://github.com/uutils/coreutils/pull/10067Exploit, Issue Tracking, Patch

Published

Apr 22, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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