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3.4

Dark Reader may expose data from local web servers

CVE-2026-92706 · published 27 days ago
Summary

The Dark Reader browser add‑on, which darkens web pages, could cause a website to make the extension fetch a small image from a program running on the user’s own network without any authentication. This can leak a tiny amount of information that shows the local service exists. Update the extension to the latest version (4.9.126 for Firefox, 4.9.128 for other browsers) to stop this behavior.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
darkreader darkreader < 4.9.128
Original advisory text
Dark Reader: Ability to request icon-like bitmap data from certain local web servers
Dark Reader is an accessibility browser extension that makes web pages colors dark. Prior to 4.9.126, a website can cause the browser extension's image inversion pipeline to request an unauthenticated icon-like bitmap from a locally running web server when the resource uses a known public-like HTTPS URL and is detected as requiring inversion. This behavior can cross the website-to-local-network boundary and disclose limited information associated with the requested resource. The darkreader npm package used for website integration is not affected. This issue is fixed in version 4.9.126 for Firefox and version 4.9.128 for other browsers.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
3.4 Low
Exploitation
<1% chance of attack within 30 days
Type
CWE-200Information Exposure
CWE-346Origin Validation Error
CWE-668Exposure of Resource to Wrong Sphere
Timeline
Published22 Sep 2026
Updated14 Oct 2026
First seen22 Sep 2026
Sources
CVE-2026-92706 · NVD
CVE-2026-92706 · MITRE
CVE-2026-92706 · OSV
GHSA-jh5x-rphw-x532 · GHSA
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