uutils coreutils has a Time-of-check Time-of-use (TOCTOU) Race Condition

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.7 · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS

• CVE-2026-35357: 0.09% estimated exploitation activity in the next 30 days; percentile 0.43 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

The cp utility in uutils coreutils is vulnerable to an information disclosure race condition. Destination files are initially created with umask-derived permissions (e.g., 0644) before being restricted to their final mode (e.g., 0600) later in the process. A local attacker can race to open the file during this window; once obtained, the file descriptor remains valid and readable even after the permissions are tightened, exposing sensitive or private file contents.

Published by the source

22 Apr 2026, 18:31 UTC

Last modified by the source

30 Apr 2026, 17:12 UTC

Source last checked

26 Oct 2026, 15:42 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-2m8x-mvfx-gwgj

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# Patch Next advisory brief: CVE-2026-35357

Advisory: uutils coreutils has a Time-of-check Time-of-use (TOCTOU) Race Condition
IDs: CVE-2026-35357, GHSA-2m8x-mvfx-gwgj
Record: https://patchnext.com/advisories/cve-2026-35357 (revision 1, source checked 26 Oct 2026, 15:42 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io coreutils: affected <= 0.8.0

## Suggested inspection (read-only)
- crates.io coreutils: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on coreutils.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-2m8x-mvfx-gwgj (GitHub-reviewed advisory GHSA-2m8x-mvfx-gwgj lists affected ranges: crates.io coreutils >=0 <=0.8.0)

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