CVE-2025-62517 Rollbar.js Prototype Pollution Vulnerability in merge()
Prototype pollution in Rollbar.js merge() allows attackers to manipulate object prototypes if untrusted input is passed to configure().
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-62517?
CVE-2025-62517 is a medium-severity vulnerability in rollbar.js, published on 23 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-1321
Which versions are affected by CVE-2025-62517?
4 open source packages ship an affected version, including rollbar.
| Package | Affected | Fixed in |
|---|---|---|
rollbar npm | All versions | 2.26.5 |
rollbar npm | All versions | 2.26.5 |
rollbar npm | From 3.0.0-alpha1 | 3.0.0-beta5 |
rollbar npm | From 3.0.0-alpha1 | 3.0.0-beta5 |
How do I fix CVE-2025-62517?
Upgrade rollbar to a fixed version for your release line: 2.26.5 or 3.0.0-beta5.
Is CVE-2025-62517 being exploited?
There is no known exploitation of CVE-2025-62517 in the wild and no public exploit code.
Sources
Also known as GHSA-xcg2-9pp4-j82x.