Prototype pollution via bypassed property-path guards
Published Jan 29, 2026 · Updated Jan 29, 2026
Prototype pollution in deepHas before 1.0.8 allows local users to alter global object behavior through attacker-controlled property paths. The add() and indexer() functions trust mutable Object.hasOwnProperty and String.prototype.indexOf guards, allowing constructor.prototype or proto paths to reach Object.prototype. Exploitation requires a downstream application to pass attacker-controlled paths to deephas.set; the resulting property changes affect objects in that JavaScript runtime.
Summary
What happened
Prototype pollution in deepHas before 1.0.8 allows local users to alter global object behavior through attacker-controlled property paths. The add() and indexer() functions trust mutable Object.hasOwnProperty and String.prototype.indexOf guards, allowing constructor.prototype or proto paths to reach Object.prototype. Exploitation requires a downstream application to pass attacker-controlled paths to deephas.set; the resulting property changes affect objects in that JavaScript runtime.
The record
- CVE
- CVE-2026-25047
- Published
- Jan 29, 2026
- Updated
- Jan 29, 2026
- Vendor
- sharpred
- Product
- deepHas
- Classifications
- CWE-1321
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 29, 2026CVE publishedPublication date reported by the CVE source.
- Jan 29, 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.
- Affected versionversion=< 1.0.7
What conditions does exploitation require?
What is affected?
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
- GHSA-2733-6c58-pf27 proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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