CVE-2026-35373 uutils coreutils ln Local Denial of Service via Improper Handling of Non-UTF-8 Filenames
The uutils coreutils ln utility fails to create links for non-UTF-8 filenames, causing local denial of service in automated scripts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-35373?
CVE-2026-35373 is a low-severity denial of service 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
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.
Weakness: CWE-176
Which versions are affected by CVE-2026-35373?
2 open source packages ship an affected version, including uu_ln. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
uu_ln crates.io | All versions | 0.6.0 |
uu_ln crates.io | All versions | 0.6.0 |
Products include Uutils Coreutils.
How do I fix CVE-2026-35373?
Upgrade uu_ln to 0.6.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-35373 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35373 exists.
Other vulnerabilities in Uutils coreutils
- CVE-2026-35338 uutils coreutils chmod Path Traversal Bypass of --preserve-root
- CVE-2026-35368 uutils coreutils chroot Local Privilege Escalation and chroot Escape in via Name Service Switch (NSS) Injection
- CVE-2026-35341 uutils coreutils mkfifo Unauthorized Permission Change on Existing Files
- CVE-2026-35352 uutils coreutils mkfifo Privilege Escalation via TOCTOU Race Condition
- CVE-2026-35349 uutils coreutils Path-Based Safety Bypass with --preserve-root
Sources
Also known as DEBIAN-CVE-2026-35373, GHSA-jcjr-rh8q-7xqf, UBUNTU-CVE-2026-35373.