Prototype pollution in Rollbar.js - CVE-2025-62517
Published: April 24, 2026
Vulnerability identifier: #VU127494
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-62517
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to modify object prototype attributes.
The vulnerability exists due to improperly controlled modification of object prototype attributes in merge() when rollbar.configure() processes untrusted input. A remote attacker can supply crafted input to modify object prototype attributes.
Affected software
Rollbar.js
How to mitigate CVE-2025-62517
Install security update from vendor's website.
Rollbar.js - update to 2.26.5