| Version | Change log |
| PuTTY Portable 0.81 Apr 15, 2024 | Security fix for CVE-2024-31497: NIST P521 / ecdsa-sha2-nistp521 signatures are no longer generated with biased values of k. The previous bias compromises private keys. |
| PuTTY Portable 0.79 Aug 28, 2023 | |
| PuTTY Portable 0.78 Oct 30, 2022 | |
| PuTTY Portable 0.77 May 30, 2022 | |
| PuTTY Portable 0.76 Jul 19, 2021 | |
| PuTTY Portable 0.75 May 9, 2021 |
Security fix: on Windows, a server could DoS the whole Windows GUI by telling the PuTTY window to change its title repeatedly at high speed. Pageant now supports loading a key still encrypted, and decrypting it later by prompting for the passphrase on first use. Upgraded default SSH key fingerprint format to OpenSSH-style SHA-256. Upgraded private key file format to PPK3, with improved passphrase hashing and no use of SHA-1. Terminal now supports ESC [ 9 m for strikethrough text. New protocols: bare ssh-connection layer for use over already-secure IPC channels, and SUPDUP for talking to very old systems such as PDP-10s. PuTTYgen now supports alternative provable-prime generation algorithm for RSA and DSA. The Unix tools can now connect directly to a Unix-domain socket. |
| PuTTY Portable 0.74 Jun 28, 2020 | |
| PuTTY Portable 0.73 Oct 1, 2019 | |
| PuTTY Portable 0.71 Mar 20, 2019 | PuTTY 0.71 includes a large number of security fixes, many of which were found by the recent EU-funded HackerOne bug bounty. There are also other security enhancements (side-channel resistance), and a few new features. It's also the first release to be built for Windows on Arm. |
