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CVE-2025-57319

CVE-2025-57319: fast-redact vulnerable to prototype pollution

fast-redact is a package that provides do very fast object redaction. A Prototype Pollution vulnerability in the nestedRestore function of fast-redact version 3.5.0 and before allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing denial of service (DoS) as the minimum consequence.

(GitHub Advisory)

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CVE-2025-57319

CVE-2025-57319:

N/A

CVSS Score

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
fast-redact	npm	<= 3.5.0

Technical Details

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Root Cause Analysis

The vulnerability description explicitly identifies the nestedRestore function as the source of the prototype pollution vulnerability in fast-redact <= 3.5.0. An analysis of the source code for lib/modifiers.js confirms this. The nestedRestore function iterates through instructions and uses unsanitized property paths to restore values on an object. Specifically, the lines current = current[path[i]] and current[path[0]] = value allow for traversal and modification of an object's prototype chain if the path array contains malicious keys like __proto__. Since no patch is available, the evidence is the vulnerable source code itself. The lack of input sanitization on the path variable is the root cause of this vulnerability.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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