PT-2026-34491 · Unknown · Uutils Coreutils

Zellic · CVE-2026-35355 · Published 2026-04-22 · Updated 2026-07-06

Positive Technologies (AI Summary)

CVSS v3.1

6.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions uutils coreutils (affected versions not specified)

Description The install utility contains a Time-of-Check to Time-of-Use (TOCTOU) race condition during file installation. This occurs because the implementation unlinks an existing destination file and recreates it using a path-based operation without the O EXCL flag. A local attacker can exploit the timing window between the unlink and creation to replace the path with a symbolic link, enabling the redirection of privileged writes to overwrite arbitrary system files. TOCTOU is a software bug where the state of a resource changes between the time it is checked and the time it is used.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Link Following

Time Of Check To Time Of Use

Weakness Enumeration

CWE-59

CWE-367

Related Identifiers

CVE-2026-35355

GHSA-239G-2685-54X3

GHSA-V24V-F45G-W7JF

Affected Products

Uutils Coreutils

References · 17

• 🔥 https://github.com/uutils/coreutils/pull/10067 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35355.json · Exploit
• https://github.com/uutils/coreutils/releases/tag/0.6.0 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-35355 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-239g-2685-54x3 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-v24v-f45g-w7jf · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-35355 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-35355 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-35355 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-35355 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-35355 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-35355 · Security Note
• https://github.com/uutils/coreutils · Note
• https://github.com/uutils/coreutils/commit/b5bbabc18a1121908848d836f869a4e98eb63886 · Note
• https://github.com/uutils/coreutils/security/advisories/GHSA-239g-2685-54x3 · Note