radashi Allows Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

6.8 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U · score source

EPSS

• CVE-2025-48054: 0.69% estimated exploitation activity in the next 30 days; percentile 52.97 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact This is a prototype pollution vulnerability. It impacts users of the set function within the Radashi library. If an attacker can control parts of the path argument to the set function, they could potentially modify the prototype of all objects in the JavaScript runtime, leading to unexpected behavior, denial of service, or even remote code execution in some specific scenarios. Patches The vulnerability has been patched in commit 8147abc8cfc3cfe9b9a17cd389076a5d97235a66. Users should upgrade to a version of Radashi that includes this commit. The fix utilizes a new helper function, isDangerousKey, to prevent the use of proto, prototype, or constructor as keys in the path, throwing an error if any are encountered. This check is bypassed for objects with a null prototype. Workarounds Users on older versions can mitigate this vulnerability by sanitizing the path argument provided to the set function to ensure that no part of the path string is proto, prototype, or constructor. For…

Published by the source

27 May 2025, 15:03 UTC

Last modified by the source

27 May 2025, 15:27 UTC

Source last checked

26 Oct 2026, 12:37 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-2xv9-ghh9-xc69

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-2xv9-ghh9-xc69

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# Patch Next advisory brief: CVE-2025-48054

Advisory: radashi Allows Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
IDs: CVE-2025-48054, GHSA-2xv9-ghh9-xc69
Record: https://patchnext.com/advisories/cve-2025-48054 (revision 3, source checked 26 Oct 2026, 12:37 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: radashi 12.5.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm radashi: affected < 12.5.1; fixed in 12.5.1

## Suggested inspection (read-only)
- `npm ls radashi --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on radashi.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-2xv9-ghh9-xc69 (OSV record GHSA-2xv9-ghh9-xc69 lists affected ranges: npm radashi >=0 <12.5.1 (fixed))
- Verified: https://github.com/advisories/GHSA-2xv9-ghh9-xc69 (GitHub-reviewed advisory GHSA-2xv9-ghh9-xc69 lists affected ranges: npm radashi >=0 <12.5.1)

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