Xqt added a comment.
The issue is not a TLS failure. HTTPS to Wikimedia works correctly with certifi==2026.6.17. The failure is caused by a legacy check that searches for a specific PEM substring (WMF_CACERT pattern in version.py) which is no longer present in the current CA bundle. The current certificate chain for Wikimedia is: *.wikipedia.org Let's Encrypt (YE1) ISRG Root X2 Since this chain is valid and trusted by modern certifi (via ISRG Root X2), the original check is no longer meaningful. TASK DETAIL https://phabricator.wikimedia.org/T430266 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/
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