CVE-2026-49458 — Security Box Score

CVE · referencelatest edition

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.

CVE-2026-49458MEDIUM

cure53 DOMPurify — DOMPurify: Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bound `instanceof` checks

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  L  L  N    6.1   .0038   31.7     —

AFFECTED
  Product    Versions   Fixed
  DOMPurify  < 3.4.6 –  —

TIMELINE
  May 30  Reserved by GitHub_M
  Jul 14  EXPLOIT PUBLISHED — CVE-2026-49458 (cure53 DOMPurify). Public exploit reference added.
  Jul 14  Published (CNA: GitHub_M)

CWE-79, CWE-501, CWE-693 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accepted same-origin foreign-realm DOM nodes while follow-on checks used parent-realm constructors, causing instanceof checks for forms, named node maps, document fragments, and elements to fail and skip clobber, template-content, and shadow-DOM sanitization branches so executable markup could survive. This issue is fixed in version 3.4.6.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 30, 2026	Reserved	Reserved by GitHub_M
July 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-49458 (cure53 DOMPurify). Public exploit reference added.
July 14, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
cure53	DOMPurify	—	< 3.4.6	—

Weaknesses

CWE-79 · CWE-501 · CWE-693

References (3)

https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae [Patch]
https://github.com/cure53/DOMPurify/releases/tag/3.4.6 [Release Notes]
https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8 [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-49458 at cve.org

Vendors: cure53

Weaknesses: CWE-79 · CWE-501 · CWE-693

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-49458 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.