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CVE-2026-85061 — MapLibre GL JS: XSS Sanitizer Bypass in...

CRITICAL

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

Published September 8, 2026Updated September 8, 2026Source: osv

Summary

### 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 `<details open onload="1" ontoggle="...">`). 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

Advisory Timeline

  • First published September 8, 2026 (34 days ago).
  • Last revised September 8, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update maplibre-gl to 6.4.1 or later
npm install maplibre-gl@6.4.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
maplibre-gl
npm
All versions6.4.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-79
    Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 10.0 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-85061?
MapLibre GL JS: XSS Sanitizer Bypass in DOM.sanitize() via Live NamedNodeMap Removal Skip This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 10.0/10).
How do I check if my project is affected by CVE-2026-85061?
CVE-2026-85061 affects maplibre-gl. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-85061 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
10.0

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-jrc7-96c5-q579

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