chore(deps): update dependency @tiptap/core to v3.30.5 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@tiptap/core (source)	3.30.4 → 3.30.5

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Tiptap: mergeAttributes() turns an own proto key into inherited executable DOM attributes

GHSA-cp6q-959q-f8rh

More information

Details

Summary

@tiptap/core's public mergeAttributes() helper uses ordinary bracket assignment on keys returned by Object.entries(). An own __proto__ key from JSON therefore invokes the legacy prototype setter on the fresh merged object. The function returns an object whose prototype is attacker-controlled, while Object.keys() and ordinary own-property checks show no attacker attributes.

When that result is used as a ProseMirror DOMOutputSpec attribute object, prosemirror-model's DOMSerializer.renderSpec() enumerates it with for...in and applies inherited values with setAttribute(). In a browser proof, inherited src and onerror values were copied to an <img> and the error handler executed once. This is per-object prototype manipulation; the proof does not modify global Object.prototype.

Root cause

The affected loop is conceptually:

const mergedAttributes = { ...items }
for (const [key, value] of Object.entries(item)) {
  const exists = mergedAttributes[key]
  // ...
  mergedAttributes[key] = value
}

Object.entries(JSON.parse('{"__proto__": {...}}')) includes __proto__. Reading mergedAttributes['__proto__'] resolves the inherited Object.prototype; assigning to the same key invokes Object.prototype.__proto__'s setter and replaces mergedAttributes' prototype.

Browser reproduction

The following shape was tested with exact @tiptap/core 3.29.2 and prosemirror-model 1.25.11:

const input = JSON.parse(`{
  "__proto__": {
    "data-inherited-canary": "present",
    "src": "x-invalid://canary",
    "onerror": "globalThis.__tiptapXss += 1"
  }
}`)

const attrs = mergeAttributes(input)
// Object.keys(attrs) === []
// Object.getPrototypeOf(attrs) === input.__proto__

const schema = new Schema({
  nodes: {
    doc: { content: 'image' },
    image: { toDOM: () => ['img', attrs] },
    text: {},
  },
})
const doc = schema.node('doc', null, [schema.node('image')])
const fragment = DOMSerializer.fromSchema(schema).serializeFragment(doc.content)
document.body.append(fragment)

Chromium produced an image with data-inherited-canary, src, and onerror; the handler executed exactly once. Object.prototype remained clean.

Impact and preconditions

Applications that merge untrusted imported document, plugin, CMS, API, tenant, or AI-derived attribute objects can receive a prototype-manipulated result. Consumers that enumerate inherited keys, including ProseMirror's DOM serializer, can turn the hidden properties into DOM attributes and execute JavaScript in the application's origin. Own-key validation, object spread, JSON serialization, and logging can miss the inherited values. Other component consumers can read inherited authorization or configuration fields.

Tiptap's standard fixed ProseMirror schemas discard unknown document attributes, so arbitrary Tiptap JSON is not automatically exploitable in every application. A vulnerable application needs an untrusted object boundary into mergeAttributes() or a dynamic/custom extension or schema that preserves the relevant attribute object.

Affected versions

The unsafe assignment was introduced in commit ecadf7ea0a7f8f39a8496a60edf0ac8f379e6eb3 and is present in the first package tag @tiptap/core@2.0.0-alpha.0, v2.0.0, v2.27.1, v3.0.0, and current v3.29.2 source. No fixed release was found.

Recommended remediation

Reject __proto__ before reading or assigning the key, or define copied keys as own data properties without invoking legacy setters. A minimal hardening is to skip key === '__proto__'. Add regression tests using an own JSON-origin __proto__ key and assert that the result keeps Object.prototype as its prototype, exposes no inherited attacker keys, and cannot create an event-handler attribute through DOMSerializer.

This was found during authorized dependency review and is being reported privately. No public zero-day issue has been opened.

Severity

• CVSS Score: 6.4 / 10 (Medium)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

References

• https://github.com/ueberdosis/tiptap/security/advisories/GHSA-cp6q-959q-f8rh
• https://github.com/ueberdosis/tiptap/commit/01d7af8c983ee5954c63734f4fa46cb23ae3246d
• https://github.com/ueberdosis/tiptap/releases/tag/v3.30.4
• https://github.com/advisories/GHSA-cp6q-959q-f8rh

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

Tiptap: Quadratic ReDoS in block and inline Markdown attribute parsing

GHSA-j95f-988m-3j2f

More information

Details

Summary

@tiptap/core contains two quadratic regular-expression denial-of-service paths in its default Markdown attribute parsers. Pandoc-style block attributes use two unanchored greedy expressions that rescan repeated __QUOTED_0 prefixes. Inline shortcode attributes use another unanchored greedy key expression that rescans a long word-character run when no equals sign follows.

The public createAtomBlockMarkdownSpec and createBlockMarkdownSpec helpers call the vulnerable Pandoc-style parser; createInlineMarkdownSpec calls the separately vulnerable shortcode parser. Using unmodified npm 3.29.2, a complete 20,508-byte atom-block token took approximately 1.40 seconds while an equal-length control took 0.29 ms. A complete 32,776-byte inline token took approximately 2.21 seconds while its equal-length control took 0.19 ms. Current repository main commit 5158212970344952dd9918b6a44bfb400d7fb6c1 retains both expressions.

Block attribute root cause

packages/core/src/utilities/markdown/attributeUtils.ts uses both matchAll and replace with /([a-zA-Z][\w-]*)\s*=\s*(__QUOTED_\d+__)/g. The candidate is '__QUOTED_0'.repeat(n) + '__QUOTED_0__'. There are no quotes, so the preceding replacement leaves it unchanged. At each Q, the greedy key-name expression consumes the remaining word-character run, the required equals sign fails, and the unanchored engine restarts at the next Q. This yields O(n^2) work, and the cleanup pass repeats it.

A complete public-API proof is:

import { createAtomBlockMarkdownSpec } from '@tiptap/core'
const tokenizer = createAtomBlockMarkdownSpec({ nodeName: 'probe' }).markdownTokenizer
const attack = '__QUOTED_0'.repeat(2048) + '__QUOTED_0__'
const source = `:::probe {${attack}} :::\n`
const started = performance.now()
tokenizer.tokenize(source, [], {})
console.log(performance.now() - started)

Measured complete-tokenizer timings were 6.23, 23.12, 88.93, 369.10, and 1,400.17 ms at 1,308, 2,588, 5,148, 10,268, and 20,508 bytes. Equal-length controls took 0.07 to 0.29 ms. The directly exported parser took 5,645.71 ms at 40,972 bytes while its control took 0.64 ms.

Inline attribute root cause

packages/core/src/utilities/markdown/createInlineMarkdownSpec.ts uses /(\w+)=(?:"([^"]*)"|'([^']*)')/g. For a long word-character run without an equals sign, \w+ consumes the remaining suffix, = fails, and the unanchored engine restarts at the next character. The default inline tokenizer extracts this attacker string directly from a syntactically complete [shortcode attributes] token.

import { createInlineMarkdownSpec } from '@tiptap/core'
const tokenizer = createInlineMarkdownSpec({ nodeName: 'probe', selfClosing: true }).markdownTokenizer
const source = `[probe ${'0'.repeat(32768)}]`
const started = performance.now()
tokenizer.tokenize(source, [], {})
console.log(performance.now() - started)

At 1,032, 2,056, 4,104, 8,200, 16,392, and 32,776 bytes, candidates took 3.24, 12.88, 54.82, 136.91, 557.83, and 2,209.47 ms. Equal-length hyphen controls took 0.02 to 0.19 ms.

Impact

Applications parsing attacker-controlled Markdown with these helpers can have a browser main thread, server event loop, or worker blocked by a small input. Persisted documents can repeatedly freeze clients; repeated requests can exhaust server-side parsing capacity. Editors that only consume validated ProseMirror JSON and never invoke the Markdown parsing path are not directly affected through document content.

History and remediation

Commit 35645d94ae9cd73448a564104c2e08f64e9564bc introduced both parsers on 14 October 2025, first released in 3.7.0. Versions 3.7.0 through current 3.29.2 and current main remain affected. Official issue, PR, and repository-advisory searches found no duplicate.

Require a start-of-string or whitespace boundary before both key-value parsers, and preferably replace the multi-pass placeholder and shortcode regex designs with deterministic single-pass tokenizers. Keep quoted values out-of-band so attacker input cannot collide with predictable __QUOTED_n__ placeholders. Add complete block and inline Markdown-tokenizer scaling regressions with equal-length controls.

Please credit GitHub user joostgrunwald as finder/reporter.

Severity

• CVSS Score: 8.7 / 10 (High)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

• https://github.com/ueberdosis/tiptap/security/advisories/GHSA-j95f-988m-3j2f
• https://github.com/ueberdosis/tiptap/commit/d0d499be3cce633cf54ca9aa9f3d8a5a1f98bd74
• https://github.com/ueberdosis/tiptap/releases/tag/v3.30.5
• https://github.com/advisories/GHSA-j95f-988m-3j2f

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

Tiptap: Quadratic ReDoS in block and inline Markdown attribute parsing

GHSA-j95f-988m-3j2f

More information

Details

Summary

@tiptap/core contains two quadratic regular-expression denial-of-service paths in its default Markdown attribute parsers. Pandoc-style block attributes use two unanchored greedy expressions that rescan repeated __QUOTED_0 prefixes. Inline shortcode attributes use another unanchored greedy key expression that rescans a long word-character run when no equals sign follows.

The public createAtomBlockMarkdownSpec and createBlockMarkdownSpec helpers call the vulnerable Pandoc-style parser; createInlineMarkdownSpec calls the separately vulnerable shortcode parser. Using unmodified npm 3.29.2, a complete 20,508-byte atom-block token took approximately 1.40 seconds while an equal-length control took 0.29 ms. A complete 32,776-byte inline token took approximately 2.21 seconds while its equal-length control took 0.19 ms. Current repository main commit 5158212970344952dd9918b6a44bfb400d7fb6c1 retains both expressions.

Block attribute root cause

packages/core/src/utilities/markdown/attributeUtils.ts uses both matchAll and replace with /([a-zA-Z][\w-]*)\s*=\s*(__QUOTED_\d+__)/g. The candidate is '__QUOTED_0'.repeat(n) + '__QUOTED_0__'. There are no quotes, so the preceding replacement leaves it unchanged. At each Q, the greedy key-name expression consumes the remaining word-character run, the required equals sign fails, and the unanchored engine restarts at the next Q. This yields O(n^2) work, and the cleanup pass repeats it.

A complete public-API proof is:

import { createAtomBlockMarkdownSpec } from '@tiptap/core'
const tokenizer = createAtomBlockMarkdownSpec({ nodeName: 'probe' }).markdownTokenizer
const attack = '__QUOTED_0'.repeat(2048) + '__QUOTED_0__'
const source = `:::probe {${attack}} :::\n`
const started = performance.now()
tokenizer.tokenize(source, [], {})
console.log(performance.now() - started)

Measured complete-tokenizer timings were 6.23, 23.12, 88.93, 369.10, and 1,400.17 ms at 1,308, 2,588, 5,148, 10,268, and 20,508 bytes. Equal-length controls took 0.07 to 0.29 ms. The directly exported parser took 5,645.71 ms at 40,972 bytes while its control took 0.64 ms.

Inline attribute root cause

packages/core/src/utilities/markdown/createInlineMarkdownSpec.ts uses /(\w+)=(?:"([^"]*)"|'([^']*)')/g. For a long word-character run without an equals sign, \w+ consumes the remaining suffix, = fails, and the unanchored engine restarts at the next character. The default inline tokenizer extracts this attacker string directly from a syntactically complete [shortcode attributes] token.

import { createInlineMarkdownSpec } from '@tiptap/core'
const tokenizer = createInlineMarkdownSpec({ nodeName: 'probe', selfClosing: true }).markdownTokenizer
const source = `[probe ${'0'.repeat(32768)}]`
const started = performance.now()
tokenizer.tokenize(source, [], {})
console.log(performance.now() - started)

At 1,032, 2,056, 4,104, 8,200, 16,392, and 32,776 bytes, candidates took 3.24, 12.88, 54.82, 136.91, 557.83, and 2,209.47 ms. Equal-length hyphen controls took 0.02 to 0.19 ms.

Impact

Applications parsing attacker-controlled Markdown with these helpers can have a browser main thread, server event loop, or worker blocked by a small input. Persisted documents can repeatedly freeze clients; repeated requests can exhaust server-side parsing capacity. Editors that only consume validated ProseMirror JSON and never invoke the Markdown parsing path are not directly affected through document content.

History and remediation

Commit 35645d94ae9cd73448a564104c2e08f64e9564bc introduced both parsers on 14 October 2025, first released in 3.7.0. Versions 3.7.0 through current 3.29.2 and current main remain affected. Official issue, PR, and repository-advisory searches found no duplicate.

Require a start-of-string or whitespace boundary before both key-value parsers, and preferably replace the multi-pass placeholder and shortcode regex designs with deterministic single-pass tokenizers. Keep quoted values out-of-band so attacker input cannot collide with predictable __QUOTED_n__ placeholders. Add complete block and inline Markdown-tokenizer scaling regressions with equal-length controls.

Please credit GitHub user joostgrunwald as finder/reporter.

Severity

• CVSS Score: 8.7 / 10 (High)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

• https://github.com/ueberdosis/tiptap/security/advisories/GHSA-j95f-988m-3j2f
• https://github.com/ueberdosis/tiptap/commit/d0d499be3cce633cf54ca9aa9f3d8a5a1f98bd74
• https://github.com/ueberdosis/tiptap
• https://github.com/ueberdosis/tiptap/releases/tag/v3.30.5

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

ueberdosis/tiptap (@​tiptap/core)

v3.30.5

Compare Source

@​tiptap/core

Patch Changes

• Fix a denial-of-service risk where crafted block or inline Markdown attributes could consume excessive CPU and block the browser or server event loop.

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