When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability affects Firefox < 134 and Firefox ESR < 128.6.

Related CVEs

CVE-2025-0239

Key Information

GHSA ID

GHSA-p4q7-g7ff-823j

Published

January 7, 2025 6:30 PM

Last Modified

January 9, 2025 9:31 AM

CVSS Score

5.0 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: September 15, 2025 6:32 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.