CVE-2026-48801
linkify-it is a links recognition library with full Unicode support. Prior to 5.0.1, LinkifyIt.prototype.match, the package's primary public API, has O(N²) algorithmic complexity for inputs containing many fuzzy links or emails because the JavaScript-level scan loop re-slices input and re-runs unanchored regex searches on progressively shorter tails. Any service that synchronously renders untrusted Markdown with linkify:true on a request hot path can inherit a worker-process denial of service triggerable by a tens-of-KB request body. This issue is fixed in version 5.0.1.
- Score
- CVSS 4.0 8.7 High
- Status
- Analyzed - security-advisories@github.com
- Published
- 2026-07-14
- Last modified
- 2026-10-24
- Weaknesses
- CWE-1333
Affected products
References
- https://github.com/markdown-it/linkify-it/security/advisories/GHSA-22p9-wv53-3rq4
- https://github.com/markdown-it/linkify-it/commit/6be6d15e0641bf1daeaa977d500cabc743166159
