CVE-2026-35353

Summary

mkdir: -m exposes directory with umask perms before chmod (race window)

Severity

low

CVSS

3.3

EPSS

0.1% (p1)

CWE

CWE-362, CWE-367, CWE-732

Also known as

GHSA-mj6p-44ch-cq69, GHSA-vf87-345h-9qhx

Published

2026-07-06

Updated

2026-07-06

Advisory details

The mkdir utility in uutils coreutils incorrectly applies permissions when using the -m flag by creating a directory with umask-derived permissions (typically 0755) before subsequently changing them to the requested mode via a separate chmod system call. In multi-user environments, this introduces a brief window where a directory intended to be private is accessible to other users, potentially leading to unauthorized data access.

Zellic finding 3.48. Reported in the Zellic uutils coreutils Program Security Assessment (for Canonical, Jan 2026), audited commit 3a07ffc5a9bd4c283e75afa548ba1f1957bad242.

References

• https://github.com/advisories/GHSA-mj6p-44ch-cq69
• https://github.com/uutils/coreutils/security/advisories/GHSA-mj6p-44ch-cq69
• https://nvd.nist.gov/vuln/detail/CVE-2026-35353
• https://github.com/uutils/coreutils/pull/10036
• https://github.com/uutils/coreutils/commit/037b9583bc03d814e8516df54ebcda6f681fe1f8
• https://github.com/uutils/coreutils/releases/tag/0.6.0

Related advisories

• CVE-2026-53518 — high · npm/@better-auth/oauth-provider
• CVE-2026-53517 — high · npm/@better-auth/oauth-provider
• APPSEC-RACE-TOCTOU — high · Web app/Business-logic race condition / TOCTOU
• CVE-2026-54754 — critical · Go/github.com/klever-io/klever-go
• GHSA-m5w8-4gq2-6f8x — critical · npm/vm2
• CVE-2026-53486 — critical · npm/@xhmikosr/decompress
• CVE-2026-87996 — high · PyPI/open-webui
• CVE-2026-55784 — high · Go/github.com/free5gc/ausf

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