Vulnerability · Published Oct 23, 2025 · Assigned by GitHub_M

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

Medium 5.9

In plain English

A medium-severity prototype pollution in rollbar.js from rollbar. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.4%top 66.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	rollbar	2.26.5	GHSA-xcg2-9pp4-j82x
npm	rollbar	3.0.0-beta5	GHSA-xcg2-9pp4-j82x

Affected products (as reported)

Vendor	Product	Versions
rollbar	rollbar.js	< 2.26.5>= 3.0.0-alpha1, < 3.0.0-beta5

Weakness: CWE-1321 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

References

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