Open-source package vulnerability · npm

CVE-2026-85061: MapLibre GL JS: XSS Sanitizer Bypass in DOM.sanitize() via Live NamedNodeMap Removal Skip

criticalCVSS 3.1 10.0GHSA-jrc7-96c5-q579

Impact DOM.sanitize() in src/util/dom.ts iterated elem.attributes (a live NamedNodeMap) while calling elem.removeAttribute() in the same loop. Removing an attribute shifts subsequent attributes down by one index, causing the iterator to skip the adjacent attribute. An attacker can provide an HTML payload with consecutive dangerous attributes (such as ).

Published Sep 8, 2026

Affected packages

maplibre-gl

Ecosystem: npm
Affected: <= 6.4.0
Fixed in: 6.4.1
Check: npm ls maplibre-gl

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Impact

DOM.sanitize() in src/util/dom.ts iterated elem.attributes (a live NamedNodeMap) while calling elem.removeAttribute() in the same loop. Removing an attribute shifts subsequent attributes down by one index, causing the iterator to skip the adjacent attribute.

An attacker can provide an HTML payload with consecutive dangerous attributes (such as `). The first attribute is stripped while the second survives and executes upon insertion into innerHTML` via the attribution control without requiring user interaction (zero-click XSS).

Applications rendering untrusted/third-party style attribution strings or user-supplied custom attributions are impacted.

Patches

The issue has been resolved by creating a static snapshot of attributes using Array.from(elem.attributes) before iteration. Please upgrade to maplibre-gl version 6.4.1 (or latest).

Workarounds

Sanitizing the attribute field of a source before passing it down to maplibre

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology