RobinHerbots Inputmask up to 5.0.9 Internal Deep Merge Helper extend.js extendDefaults/extendDefinitions/extendAliases prototype pollution

Summaryinfo

A vulnerability was found in RobinHerbots Inputmask up to 5.0.9. It has been classified as critical. This affects the function extendDefaults/extendDefinitions/extendAliases in the library lib/dependencyLibs/extend.js of the component Internal Deep Merge Helper. This manipulation causes prototype pollution. The identification of this vulnerability is CVE-2026-16150. It is possible to initiate the attack remotely. There is no exploit available. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability classified as critical was found in RobinHerbots Inputmask up to 5.0.9. Affected by this vulnerability is the function extendDefaults/extendDefinitions/extendAliases in the library lib/dependencyLibs/extend.js of the component Internal Deep Merge Helper. The manipulation with an unknown input leads to a prototype pollution vulnerability. The CWE definition for the vulnerability is CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-16150. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/17/2026). MITRE ATT&CK project uses the attack technique T1059 for this issue.

The project was informed of the problem early through an issue report but has not responded yet.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• RobinHerbots

Name

• Inputmask

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.0.8
• 5.0.9

Website

• Product: https://github.com/RobinHerbots/Inputmask/

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Submitinfo

Accepted

• Submit #856979: Node.js Inputmask 5.0.9 Prototype Pollution (by wjm1)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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