PuTTY 0.81 security release

Version0.81 of the PuTTY SSH client is out with a fix for CVE-2024-31497;some users will want to update and generate new keys:

PuTTY 0.81, released today, fixes a critical vulnerability CVE-2024-31497 in the use of 521-bit ECDSA keys (ecdsa-sha2-nistp521). If you have used a 521-bit ECDSA private key with any previous version of PuTTY, consider the private key compromised: remove the public key from authorized_keys files, and generate a new key pair.

However, this only affects that one algorithm and key size. No other size of ECDSA key is affected, and no other key type is affected.

(Thanks to Joe Nahmias).