Vulnerability · Published Apr 22, 2026 · Assigned by canonical
CVE-2026-35359uutils coreutils cp Information Disclosure via Time-of-Check to Time-of-Use Symlink Swap
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 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rust-coreutils | no fix listed | DEBIAN-CVE-2026-35359 |
| Debian:13 | rust-coreutils | no fix listed | DEBIAN-CVE-2026-35359 |
| Debian:14 | rust-coreutils | 0.8.0-1 | DEBIAN-CVE-2026-35359 |
| Ubuntu:24.04:LTS | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35359 |
| Ubuntu:25.10 | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35359 |
| Ubuntu:26.04:LTS | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35359 |
| Ubuntu:26.10 | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35359 |
Affected products (as reported)
Weakness: CWE-367, CWE-59 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/uutils/coreutils/issues/10017 issue-tracking