curl 8.21.0 addresses eighteen security vulnerabilities—a release record—including authentication state leaks, improper connection reuse, denial-of-service conditions, and use-after-free bugs spanning QUIC, HTTP/2, and WebSocket implementations. Developers must apply this update urgently across production systems, particularly those relying on Digest authentication or multiplexed protocols. Planned deprecations of local crypto, NTLM, SMB, and TLS-SRP support require users to begin migration planning immediately.
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