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How the mentioned CVE works
The CVE-2025-22083 vulnerability exists within the `merge()` function of the rollbar.js library. This function is used to deeply merge properties from a source object into a target object. A flaw in its implementation allows an attacker to inject properties into the function’s arguments. If an application calls `rollbar.configure()` with user-supplied, untrusted input, this maliciously crafted input can be passed to the vulnerable `merge()` function. By specifying special property keys like `__proto__` or constructor.prototype, the attacker can pollute the global Object prototype. This pollution means that every object created in the application after the attack will inherit these malicious properties, potentially altering the application’s behavior, enabling denial of service, or in severe cases, leading to remote code execution.
DailyCVE
Platform: rollbar.js
Version: <=2.26.4, 3.0.0-alpha1-beta4
Vulnerability: Prototype Pollution
Severity: Moderate
Date: 2025-10-23
Prediction: Patch available
What Undercode Say:
`curl -s https://registry.npmjs.org/rollbar/-/rollbar-2.26.5.tgz | shasum -a 256`
`npm audit –production`
`grep -r “rollbar.configure” src/`
How Exploit:
An attacker crafts a malicious JSON payload containing a `__proto__` property and submits it to an endpoint that passes the data to rollbar.configure(). This triggers the prototype pollution in the underlying `merge()` function.
Protection from this CVE
Upgrade to rollbar.js version 2.26.5 or 3.0.0-beta5. Sanitize all inputs. Avoid passing user-controlled objects to rollbar.configure().
Impact
Application instability, Denial-of-Service, potential Remote Code Execution.
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Sources:
Reported By: github.com
Extra Source Hub:
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