# CVE-2026-35358: uutils coreutils cp Semantic Loss and Potential Denial of Service with -R via Device Node Stream Reading

> The cp utility in uutils coreutils causes denial of service by reading device nodes as streams during recursive copies, leading to disk exhaustion or hangs.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L`)
- **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:** Yes
- **Published:** 22 Apr 2026
- **Updated:** 22 Apr 2026
- **Also known as:** DEBIAN-CVE-2026-35358, GHSA-8vrf-r662-2w2v, UBUNTU-CVE-2026-35358

## What is CVE-2026-35358?

CVE-2026-35358 is a medium-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

The cp utility in uutils coreutils, when performing recursive copies (-R), incorrectly treats character and block device nodes as stream sources rather than preserving them. Because the implementation reads bytes into regular files at the destination instead of using mknod, device semantics are destroyed (e.g., /dev/null becomes a regular file). This behavior can lead to runtime denial of service through disk exhaustion or process hangs when reading from unbounded device nodes.

Weakness: CWE-706 (Use of Incorrectly-Resolved Name or Reference)

## Which versions are affected by CVE-2026-35358?

2 open source packages ship an affected version, including uu_cp. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `uu_cp` | crates.io | All versions | 0.7.0 |
| `uu_cp` | crates.io | All versions | 0.7.0 |

Products: Uutils Coreutils.

## How do I fix CVE-2026-35358?

Upgrade uu_cp to 0.7.0 or later.

## Is CVE-2026-35358 being exploited?

There is no known exploitation of CVE-2026-35358 in the wild and no public exploit code.

## Other vulnerabilities in Uutils coreutils

- [CVE-2026-35338](https://insights.sbomify.com/CVE-2026-35338/): uutils coreutils chmod Path Traversal Bypass of --preserve-root (high 7.3)
- [CVE-2026-35368](https://insights.sbomify.com/CVE-2026-35368/): uutils coreutils chroot Local Privilege Escalation and chroot Escape in via Name Service Switch (NSS) Injection (high 7.2)
- [CVE-2026-35341](https://insights.sbomify.com/CVE-2026-35341/): uutils coreutils mkfifo Unauthorized Permission Change on Existing Files (high 7.1)
- [CVE-2026-35352](https://insights.sbomify.com/CVE-2026-35352/): uutils coreutils mkfifo Privilege Escalation via TOCTOU Race Condition (high 7.0)
- [CVE-2026-35349](https://insights.sbomify.com/CVE-2026-35349/): uutils coreutils Path-Based Safety Bypass with --preserve-root (medium 6.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-35358 and fix it if it is affected.

What it is: CVE-2026-35358 is a medium-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.
Exploitation: There is no known exploitation of CVE-2026-35358 in the wild and no public exploit code.

Affected packages and fixed versions:
- uu_cp (crates.io): affected all versions; fixed in 0.7.0
- uu_cp (crates.io): affected all versions; fixed in 0.7.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-35358/ (Markdown: https://insights.sbomify.com/CVE-2026-35358/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-35358
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-35358
- OSV: https://osv.dev/vulnerability/CVE-2026-35358

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-35358/
Summaries are generated and may contain mistakes; the official description above is the record.