CVE-2025-62517: Rollbar Rollbar.js

Medium severity, CVSS 5.9. EPSS: 0.4% chance of exploitation in the next 30 days.

Rollbar.js offers error tracking and logging from Javascript to Rollbar. In versions before 2.26.5 and from 3.0.0-alpha1 to before 3.0.0-beta5, there is a prototype pollution vulnerability in merge(). If application code calls rollbar.configure() with untrusted input, prototype pollution is possible. This issue has been fixed in versions 2.26.5 and 3.0.0-beta5. A workaround involves ensuring that values passed to rollbar.configure() do not contain untrusted input.

Affected products

• Rollbar Rollbar.js: before 2.26.5 (fixed in 2.26.5); from 3.0.0-alpha1, before 3.0.0-beta5 (fixed in 3.0.0-beta5)

Published 2025-10-23. Last modified 2026-10-08.