Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV N L N N N N N H 8.7 .0035 28.5 —
AFFECTED Product Versions Fixed linkify-it < 5.0.1 – —
TIMELINE May 22 Reserved by GitHub_M Jul 14 EXPLOIT PUBLISHED — CVE-2026-48801 (markdown-it linkify-it). Public exploit reference added. Jul 14 Published (CNA: GitHub_M)
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.
| Date | Event | Detail |
|---|---|---|
| May 22, 2026 | Reserved | Reserved by GitHub_M |
| July 14, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-48801 (markdown-it linkify-it). Public exploit reference added. |
| July 14, 2026 | Published | Published (CNA: GitHub_M) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| markdown-it | linkify-it | — | < 5.0.1 | — |
Authoritative record: CVE-2026-48801 at cve.org
Vendors: markdown-it
Weaknesses: CWE-1333
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-48801 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.