CVE-2026-35357 uutils coreutils cp Information Disclosure via Permission Handling Race

What is CVE-2026-35357?

CVE-2026-35357 is a medium-severity vulnerability in Uutils coreutils, published on 22 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The cp utility in uutils coreutils is vulnerable to an information disclosure race condition. Destination files are initially created with umask-derived permissions (e.g., 0644) before being restricted to their final mode (e.g., 0600) later in the process. A local attacker can race to open the file during this window; once obtained, the file descriptor remains valid and readable even after the permissions are tightened, exposing sensitive or private file contents.

Weakness: CWE-367

Which versions are affected by CVE-2026-35357?

2 open source packages ship an affected version, including coreutils. It affects 1 product.

Products include Uutils Coreutils.

How do I fix CVE-2026-35357?

Apply the vendor's patch.

Is CVE-2026-35357 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35357 exists.

Other vulnerabilities in Uutils coreutils

• CVE-2026-35338 uutils coreutils chmod Path Traversal Bypass of --preserve-root High 7.3
• CVE-2026-35368 uutils coreutils chroot Local Privilege Escalation and chroot Escape in via Name Service Switch (NSS) Injection High 7.2
• CVE-2026-35341 uutils coreutils mkfifo Unauthorized Permission Change on Existing Files High 7.1
• CVE-2026-35352 uutils coreutils mkfifo Privilege Escalation via TOCTOU Race Condition High 7.0
• CVE-2026-35349 uutils coreutils Path-Based Safety Bypass with --preserve-root Medium 6.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-35357, GHSA-2m8x-mvfx-gwgj, UBUNTU-CVE-2026-35357.