CVE-2025-62517

Rollbar.js Prototype Pollution Vulnerability in merge()

5.9 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: High
Availability: None

Exploit likelihood

0.39%Up 0.4 points since Oct 24, 2025

What each source reports

CVE List Score used 5.9

Rollbar.js Prototype Pollution Vulnerability in merge()

Record: CVE-2025-62517
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness: CWE-1321
Updated: 2026-11-02

EUVDEUVD-2025-35708 5.9

Record: EUVD-2025-35708
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-xcg2-9pp4-j82x 5.9

rollbar vulnerable to Prototype Pollution in merge()

Impact

Prototype pollution vulnerability in merge(). If application code calls rollbar.configure() with untrusted input, prototype pollution is possible.

Patches

Fixed in 2.26.5 and 3.0.0-beta5.

Workarounds

Ensure that values passed to rollbar.configure() do not contain untrusted input.

References

Fixed in https://github.com/rollbar/rollbar.js/pull/1394 (2.26.x) and https://github.com/rollbar/rollbar.js/pull/1390 (3.x)

Record: GHSA-xcg2-9pp4-j82x
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness: CWE-1321
Updated: 2026-11-02

NVD 5.9

Record: CVE-2025-62517
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness: CWE-1321
Updated: 2026-11-02

OSV 5.9

Rollbar.js Prototype Pollution Vulnerability in merge()

Record: CVE-2025-62517
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness: CWE-1321
Updated: 2026-11-02

OSVGHSA-xcg2-9pp4-j82x 5.9

rollbar vulnerable to Prototype Pollution in merge()

Impact

Prototype pollution vulnerability in merge(). If application code calls rollbar.configure() with untrusted input, prototype pollution is possible.

Patches

Fixed in 2.26.5 and 3.0.0-beta5.

Workarounds

Ensure that values passed to rollbar.configure() do not contain untrusted input.

References

Fixed in https://github.com/rollbar/rollbar.js/pull/1394 (2.26.x) and https://github.com/rollbar/rollbar.js/pull/1390 (3.x)

Record: GHSA-xcg2-9pp4-j82x
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness: CWE-1321
Updated: 2026-11-02

Affected products

rollbar rollbar.js

Affected packages

Affected packages
Package	Affected	Fixed
`rollbar` npm	through 2.26.4	2.26.5
`rollbar` npm	3.0.0-alpha1 to 3.0.0-beta4	3.0.0-beta5
`rollbar` npm	before 2.26.5	2.26.5
`rollbar` npm	3.0.0-alpha1 up to 3.0.0-beta5	3.0.0-beta5

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-62517 is a medium vulnerability (CVSS 5.9) in Rollbar Rollbar.js, published October 23, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.39%, the 33rd percentile. Fixed in rollbar 2.26.5.