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Simon Tatham

We've released version 0.81. This is a SECURITY UPDATE, fixing a in ECDSA signing for .

If you've used a 521-bit ECDSA key (ecdsa-sha2-nistp521) with any previous version of PuTTY, consider it compromised! Generate a new key pair, and remove the old public key from authorized_keys files.

Other key types are not affected, even other sizes of ECDSA. In particular, Ed25519 is fine.

This vulnerability has id CVE-2024-31497. Full information is at chiark.greenend.org.uk/~sgtath

www.chiark.greenend.org.ukPuTTY vulnerability vuln-p521-bias