CVE-2025-62517: Rollbar.js Prototype Pollution Vulnerability in merge()

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-23 · updated 2026-10-08
Weakness: CWE-1321

Description

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.js: before 2.26.5; from 3.0.0-alpha1, < 3.0.0-beta5

References

https://github.com/rollbar/rollbar.js/commit/61032fe6c208b71e249514800808a54bcb8cb8bb
https://github.com/rollbar/rollbar.js/commit/d717def8b68f4a947975d0aebb729869cdb2d343
https://github.com/rollbar/rollbar.js/pull/1390
https://github.com/rollbar/rollbar.js/pull/1394
https://github.com/rollbar/rollbar.js/security/advisories/GHSA-xcg2-9pp4-j82x

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