mickhansen dottie.js up to 2.0.6 set prototype pollution

Summaryinfo

A vulnerability categorized as critical has been discovered in mickhansen dottie.js up to 2.0.6. The affected element is the function Set. Such manipulation leads to prototype pollution. This vulnerability is documented as CVE-2026-27837. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in mickhansen dottie.js up to 2.0.6 and classified as critical. Affected by this issue is the function set. The manipulation with an unknown input leads to a prototype pollution vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Dottie provides nested object access and manipulation in JavaScript. Versions 2.0.4 through 2.0.6 contain an incomplete fix for CVE-2023-26132. The prototype pollution guard introduced in commit `7d3aee1` only validates the first segment of a dot-separated path, allowing an attacker to bypass the protection by placing `__proto__` at any position other than the first. Both `dottie.set()` and `dottie.transform()` are affected. Version 2.0.7 contains an updated fix to address the residual vulnerability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-27837 since 02/24/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

The vulnerability scanner Nessus provides a plugin with the ID 300393 (Linux Distros Unpatched Vulnerability : CVE-2026-27837), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.0.7 eliminates this vulnerability. Applying the patch 7e8fa1345a4b46325f0eab8d7aeb1c4deaefdb14 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (300393). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• JavaScript Library

Vendor

• mickhansen

Name

• dottie.js

Version

• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4
• 2.0.5
• 2.0.6

License

• open-source

Website

• Product: https://github.com/mickhansen/dottie.js/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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