CVE-2026-35359Public exploit

Local file disclosure via symlink swap

Published Apr 22, 2026 · Updated Apr 22, 2026

TOCTOU link following in uutils coreutils cp allows local users to disclose sensitive files through a concurrent source-path swap. The utility checks path-based metadata for a symbolic link, then opens the same path without O_NOFOLLOW, allowing replacement between operations. Exploitation requires write access to the source tree, a more-privileged cp process, and an attacker-readable destination for the copied data.

CVSS severity4.7
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU link following in uutils coreutils cp allows local users to disclose sensitive files through a concurrent source-path swap. The utility checks path-based metadata for a symbolic link, then opens the same path without O_NOFOLLOW, allowing replacement between operations. Exploitation requires write access to the source tree, a more-privileged cp process, and an attacker-readable destination for the copied data.

The record

CVE
CVE-2026-35359
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
uutils
Product
coreutils
Classifications
CWE-59, CWE-367, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

uutils · coreutilsAffected versions are unavailable in this record.

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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