Prototype pollution vulnerability in merge(). If application code calls rollbar.configure() with untrusted input, prototype pollution is possible.
Fixed in 2.26.5 and 3.0.0-beta5.
Ensure that values passed to rollbar.configure() do not contain untrusted input.
Fixed in https://github.com/rollbar/rollbar.js/pull/1394 (2.26.x) and https://github.com/rollbar/rollbar.js/pull/1390 (3.x)
{
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2025-10-23T20:31:30Z",
"severity": "MODERATE",
"nvd_published_at": "2025-10-23T20:15:41Z"
}