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certfr-2026-avi-1049 — De multiples vulnérabilités ont été découvertes dans Oracle MySQL. Certaines d'entre elles permettent à un attaquant de…

certfr-2026-avi-1049

EUVD-2026-337887

fkie_cve-2026-49458

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.

GHSA-hpcv-96wg-7vj8 — DOMPurify: Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bound `instanceof` checks

Affected: npm: dompurify

# Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bound `instanceof` checks

**CWE**: CWE-79 (XSS — Improper Neutralization of Input During Web Page Generation) via CWE-693 (Protection Mechanism Failure — realm-bound `instanceof` checks fail-open on foreign-realm DOM nodes) and CWE-501 (Trust Boundary Violation — foreign-realm nodes accepted for sanitization but later checks are bound to the parent realm)

## Summary

`DOMPurify.sanitize(node, { IN_PLACE: true })` accepts a DOM node from any same-origin realm (e.g. a node owned by an application-created iframe document), but several follow-on security checks compare the node against constructors from the parent realm. Because constructors are per-realm, `instanceof HTMLFormElement`, `instanceof NamedNodeMap`, `instanceof DocumentFragment`, and `instanceof Element` all return `false` for nodes belonging to the iframe's realm. The library therefore proceeds as if the foreign-realm form is not clobberable, the foreign-realm `<template>`'s `.content` is not a document fragment, and the foreign-realm attached shadow root is not a document fragment — silently skipping the clobber/template-content/shadow-DOM sanitization branches that those checks gate. Attacker-controlled markup survives in form attributes, template content, and attached shadow roots, and executes when the application later inserts or activates the sanitized node.

## Affected

- DOMPurify ≤ 3.4.5, including `main` at `89da34e03ec17868e…

UBUNTU-CVE-2026-49458

Affected: Ubuntu:16.04:LTS: dompurify.js, Ubuntu:18.04:LTS: dompurify.js, Ubuntu:22.04:LTS: node-dompurify, Ubuntu:24.04:LTS: node-dompurify, Ubuntu:26.04:LTS: node-dompurify