JLSEC-2026-1086 libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow...

libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow vulnerability in the ssh2ciphercrypt function in src/openssl.c that allows a malicious SSH server to crash any connecting client by negotiating AES-GCM ciphers during handshake. Attackers can exploit...