CVE-2026-35359

Description

A Time-of-Check to Time-of-Use (TOCTOU) vulnerability in the cp utility of uutils coreutils allows an attacker to bypass no-dereference intent. The utility checks if a source path is a symbolic link using path-based metadata but subsequently opens it without the O_NOFOLLOW flag. An attacker with concurrent write access can swap a regular file for a symbolic link during this window, causing a privileged cp process to copy the contents of arbitrary sensitive files into a destination controlled by the attacker.

Predictions

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-35359
• https://github.com/uutils/coreutils/issues/10017
• https://github.com/uutils/coreutils
• https://security-tracker.debian.org/tracker/CVE-2026-35359
• https://github.com/advisories/GHSA-hpfw-mqm3-33jh