CVE-2026-48801

Aliases:GHSA-22p9-wv53-3rq4
Advisory lineage Upstream: 0 Downstream: 2
PUBLISHED
Published: 14 Jul 2026, 20:03
Last modified:15 Jul 2026, 12:56

Vulnerability Summary

Overall Risk (default)
medium
35/100
CVSS Score
8.7 HIGH
v4.0 (cve.org)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

14 Jul 2026, 20:03
Published
Vulnerability first disclosed
15 Jul 2026, 12:56
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v4.0•HIGH•Score: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Techniques & Countermeasures

  • CWE-1333•Inefficient Regular Expression Complexity

    The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.

Affected Systems

  • markdown-it•linkify-it

    < 5.0.1

  • Npm•linkify-it

    < 5.0.1

References (3)