Local file disclosure via permissive destination creation
Published Apr 22, 2026 · Updated Apr 22, 2026
Information disclosure in uutils coreutils cp 0.8.0 and earlier allows local users to read copied file contents during creation. The cp utility creates a destination with umask-derived permissions before applying the source file's restrictive mode, leaving an openable window. Exploitation requires concurrent local access to the destination directory, and an acquired descriptor remains readable after chmod tightens permissions.
Summary
What happened
Information disclosure in uutils coreutils cp 0.8.0 and earlier allows local users to read copied file contents during creation. The cp utility creates a destination with umask-derived permissions before applying the source file's restrictive mode, leaving an openable window. Exploitation requires concurrent local access to the destination directory, and an acquired descriptor remains readable after chmod tightens permissions.
The record
- CVE
- CVE-2026-35357
- Published
- Apr 22, 2026
- Updated
- Apr 22, 2026
- Vendor
- uutils
- Product
- coreutils
- Classifications
- CWE-367, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 22, 2026CVE publishedPublication date reported by the CVE source.
- 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?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- cp permission-race reproductionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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