Log in Start free

Vulnerability · Published Apr 22, 2026 · Assigned by canonical

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

Medium 4.7

In plain English

A medium-severity security flaw in coreutils from Uutils. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 0% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)<0.1%top 99.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rust-coreutilsno fix listedDEBIAN-CVE-2026-35357
Debian:13rust-coreutilsno fix listedDEBIAN-CVE-2026-35357
Debian:14rust-coreutils0.8.0-1DEBIAN-CVE-2026-35357
Ubuntu:24.04:LTSrust-coreutilsno fix listedUBUNTU-CVE-2026-35357
Ubuntu:25.10rust-coreutilsno fix listedUBUNTU-CVE-2026-35357
Ubuntu:26.04:LTSrust-coreutilsno fix listedUBUNTU-CVE-2026-35357
Ubuntu:26.10rust-coreutilsno fix listedUBUNTU-CVE-2026-35357

Affected products (as reported)

VendorProductVersions
Uutils coreutils see references

Weakness: CWE-367 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

References