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WordPress contributors have worked quickly over the past 24 hours to prepare a 6.4.1 maintenance release after a critical bug emerged from a change in the Requests library, causing problems with updates on servers running older versions of cURL.
Hosting companies began reporting widespread impact of the bug. Tom Sommer, from one of Denmark’s largest hosting companies, filed a GitHub issue outlining how the cURL timeouts were affecting sites:
#657 breaks downloads towards https://api.wordpress.org/ and many other sites when using Curl 7.29.0 (and perhaps other versions)