Vulnerability · Published Apr 22, 2026 · Assigned by canonical
CVE-2026-35356uutils coreutils install Arbitrary File Overwrite with -D via Path Component Symlink Race
Medium 6.3
In plain English
A medium-severity security flaw in coreutils from Uutils. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the install utility of uutils coreutils when using the -D flag. The command creates parent directories and subsequently performs a second path resolution to create the target file, neither of which is anchored to a directory file descriptor. An attacker with concurrent write access can replace a path component with a symbolic link between these operations, redirecting the privileged write to an arbitrary file system location.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rust-coreutils | no fix listed | DEBIAN-CVE-2026-35356 |
| Debian:13 | rust-coreutils | no fix listed | DEBIAN-CVE-2026-35356 |
| Debian:14 | rust-coreutils | 0.7.0-1 | DEBIAN-CVE-2026-35356 |
| Ubuntu:24.04:LTS | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35356 |
| Ubuntu:25.10 | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35356 |
Affected products (as reported)
Weakness: CWE-367 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
References
- https://github.com/uutils/coreutils/pull/10140 patch, issue-tracking
- https://github.com/uutils/coreutils/releases/tag/0.7.0 vendor-advisory