CVE-2026-35355Public exploit

Arbitrary file overwrite via symlink TOCTOU race

Published Apr 22, 2026 · Updated Apr 22, 2026

TOCTOU race in uutils coreutils install before 0.6.0 allows local users to overwrite arbitrary files through a symlink swap. The copy_file function removes the destination and recreates it by pathname with File::create or fs::copy, without exclusive creation. Exploitation requires write access to the destination directory and winning the unlink-to-create race; privileged execution redirects the resulting write.

CVSS severity6.3
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU race in uutils coreutils install before 0.6.0 allows local users to overwrite arbitrary files through a symlink swap. The copy_file function removes the destination and recreates it by pathname with File::create or fs::copy, without exclusive creation. Exploitation requires write access to the destination directory and winning the unlink-to-create race; privileged execution redirects the resulting write.

The record

CVE
CVE-2026-35355
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
uutils
Product
coreutils
Classifications
CWE-59, CWE-367
Attack vector
local
Privileges
Unavailable

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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

uutils · coreutilsversion=0 <0.6.0

Published CVSS scores

6.3Canonical Ltd.CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H

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.

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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
PrivilegesUnavailable
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

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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