Vulnerability · Published Apr 22, 2026 · Assigned by canonical
CVE-2026-35373uutils coreutils ln Local Denial of Service via Improper Handling of Non-UTF-8 Filenames
Low 3.3
In plain English
A low-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 logic error in the ln utility of uutils coreutils causes the program to reject source paths containing non-UTF-8 filename bytes when using target-directory forms (e.g., ln SOURCE... DIRECTORY). While GNU ln treats filenames as raw bytes and creates the links correctly, the uutils implementation enforces UTF-8 encoding, resulting in a failure to stat the file and a non-zero exit code. In environments where automated scripts or system tasks process valid but non-UTF-8 filenames common on Unix filesystems, this divergence causes the utility to fail, leading to a local denial of service for those specific operations.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rust-coreutils | no fix listed | DEBIAN-CVE-2026-35373 |
| Debian:13 | rust-coreutils | no fix listed | DEBIAN-CVE-2026-35373 |
| Debian:14 | rust-coreutils | 0.10.0-1 | DEBIAN-CVE-2026-35373 |
| Ubuntu:24.04:LTS | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35373 |
| Ubuntu:25.10 | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35373 |
| Ubuntu:26.04:LTS | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35373 |
| Ubuntu:26.10 | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35373 |
Affected products (as reported)
Weakness: CWE-176 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
References
- https://github.com/uutils/coreutils/pull/11403 patch, issue-tracking