CVE-2025-62517

Rollbar.js Prototype Pollution Vulnerability in merge()

MEDIUM
5.9
CVSS Score
Published: October 23, 2025 at 07:52 PM UTC
Updated: October 8, 2026 at 11:10 AM UTC
1 product affected across 1 vendorRollbar.js

Using rollbar.js by rollbar?

Get instant alerts when new vulnerabilities affect rollbar.js - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM5.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 2.26.5>= 3.0.0-alpha1, < 3.0.0-beta5
Affected range stops below 2.26.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.0.0-beta5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-1321

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card