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High, CVSS 8.7amended

Tiptap: Quadratic ReDoS in block and inline Markdown attribute parsing

GHSA-j95f-988m-3j2f

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@tiptap/core 3.30.5), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.7 · 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 · score source
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

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 QUOTED0 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…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-j95f-988m-3j2f

  2. Revision 3 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 2 · amended ·

    Amended from osv record GHSA-j95f-988m-3j2f

  4. Revision 1 · created ·

    Published from ghsa record GHSA-j95f-988m-3j2f

Agent brief

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# Patch Next advisory brief: GHSA-j95f-988m-3j2f

Advisory: Tiptap: Quadratic ReDoS in block and inline Markdown attribute parsing
IDs: GHSA-j95f-988m-3j2f
Record: https://patchnext.com/advisories/ghsa-j95f-988m-3j2f (revision 4, source checked 26 Oct 2026, 13:02 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @tiptap/core 3.30.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @tiptap/core: affected >= 3.7.0, < 3.30.5; fixed in 3.30.5

## Suggested inspection (read-only)
- `npm ls @tiptap/core --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @tiptap/core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-j95f-988m-3j2f (GitHub-reviewed advisory GHSA-j95f-988m-3j2f lists affected ranges: npm @tiptap/core >=3.7.0 <3.30.5)
- Verified: https://osv.dev/vulnerability/GHSA-j95f-988m-3j2f (OSV record GHSA-j95f-988m-3j2f lists affected ranges: npm @tiptap/core >=3.7.0 <3.30.5 (fixed))

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