🛡️ CVE-2026-35359 — coreutils

🟡 CVSS 4.7 — Medium ⚠️ Exploit Public CWE-59 OSV

4.7

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

uutils coreutils has a Link Following issue

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2026-35359 is classified as CWE-59: Link Following. The software follows symbolic or hard links without verifying their target, so a planted link can redirect an operation to a sensitive file.

Affected software

CVE-2026-35359 is recorded against 1 package.

coreutils

Timeline and source

Published on 22 April 2026 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)

CVE-2026-35359 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian Ubuntu

Details

Severity MEDIUM

CVSS Score 4.7

CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CWE CWE-59

Public Exploit ⚠️ Yes

Source OSV

Published 2026-04-22

Updated 2026-08-20

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
coreutils	—	—

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-35359

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

PACKAGE https://github.com/uutils/coreutils

🔗 NVD 🔗 Mitre

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