| Title | brikcss @brikcss/merge 1.3.0 Prototype Pollution |
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| Description | The @brikcss/merge package is vulnerable to Prototype Pollution - a critical security vulnerability that allows attackers to inject arbitrary properties into JavaScript's global object prototype. This occurs because the merge function recursively processes objects without properly sanitizing special keys like __proto__, constructor.prototype, and prototype.
When an attacker controls the source object being merged, they can inject properties into Object.prototype, affecting all objects in the application.
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| Source | ⚠️ https://github.com/sudo-secure/security-research/blob/main/brikcss-merge/prototype-pollution/PoC.md |
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| User | sudosme (UID 96548) |
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| Submission | 03/28/2026 05:58 (24 days ago) |
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| Moderation | 04/19/2026 12:42 (22 days later) |
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| Status | Accepted |
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| VulDB entry | 358229 [brikcss merge up to 1.3.0 __proto__/constructor.prototype/prototype prototype pollution] |
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| Points | 20 |
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