AIKIDO-2026-65180
@tiptap/core is vulnerable to Prototype Pollution
72
High Risk
This Affects:
@tiptap/coreTL;DR
The mergeAttributes() helper in @tiptap/core assigns attribute keys from an object without filtering the __proto__ key. Processing document or API data that contains an own __proto__ property invokes the legacy prototype setter and injects values into an object's prototype. When the resulting object is rendered as a ProseMirror DOM output attribute set, inherited properties are applied via setAttribute, executing JavaScript in the application origin. The fix skips the __proto__ key during attribute merging.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application merges untrusted document or API data into editor node attributes.
Background info
@tiptap/core is vulnerable to Prototype Pollution in versions 2.0.0 - 3.30.3.
How to fix this
Upgrade the @tiptap/core library to the patch version.
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