Prototype pollution via unsafe recursive object merge
Published Feb 24, 2023 · Updated Mar 11, 2025
Prototype pollution in Tim Down Rangy before 1.3.2 allows attackers to modify Object.prototype via a crafted object passed to extend(). The recursive merge follows attacker-controlled proto, constructor, or prototype keys instead of rejecting them, then copies nested values onto Object.prototype. Exploitation requires consuming code to pass attacker-controlled properties to extend(); polluted properties can alter application behavior or interrupt the process.
Summary
What happened
Prototype pollution in Tim Down Rangy before 1.3.2 allows attackers to modify Object.prototype via a crafted object passed to extend(). The recursive merge follows attacker-controlled proto, constructor, or prototype keys instead of rejecting them, then copies nested values onto Object.prototype. Exploitation requires consuming code to pass attacker-controlled properties to extend(); polluted properties can alter application behavior or interrupt the process.
The record
- CVE
- CVE-2023-26102
- Published
- Feb 24, 2023
- Updated
- Mar 11, 2025
- Vendor
- Tim Down
- Product
- Rangy
- Classifications
- CWE-1321
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 24, 2023CVE publishedPublication date reported by the CVE source.
- Mar 11, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <*
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
- Rangy extend() Object.prototype pollution proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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