What’s Vulnerable › Vulnerabilities

CVE-2026-35359: uutils coreutils cp Information Disclosure via Time-of-Check to Time-of-Use Symlink Swap

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-22 · updated 2026-10-26
• Weakness: CWE-59

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.

Affected products

• Uutils coreutils: all versions

References

• https://github.com/uutils/coreutils/issues/10017
• https://github.com/uutils/coreutils/issues/10017

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