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EUVD-2026-253563

fkie_cve-2025-57325

rollbar is a package designed to effortlessly track and debug errors in JavaScript applications. This package includes advanced error tracking features and an intuitive interface to help you identify and fix issues more quickly. A Prototype Pollution vulnerability in the utility.set function of rollbar v2.26.4 and before allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing denial of service (DoS) as the minimum consequence.

GHSA-r8c2-2qwq-94p6 — rollbar vulnerable to prototype pollution

Affected: npm: rollbar

### Impact

Prototype pollution potential with the utility function `rollbar/src/utility`.`set()`. No impact when using the published public interface.

If application code directly imports `set` from `rollbar/src/utility` and then calls `set` with untrusted input in the second argument, it is vulnerable to prototype pollution.

POC:

```js const obj = {}; require("rollbar/src/utility").set(obj, "__proto__.polluted", "vulnerable"); console.log({}.polluted !== undefined ? '[POLLUTION_TRIGGERED]':''); ```

### Patches

Fixed in version 2.26.5 and 3.0.0-beta5.

### Workarounds

If application code directly imports `set` from `rollbar/src/utility`, ensure that the second argument does not receive untrusted input.

### References

https://github.com/rollbar/rollbar.js/issues/1333#issuecomment-3353720946