Libssh: write beyond bounds in binary to base64 conversion functions

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CVE-2025-4877 Libssh: write beyond bounds in binary to base64 conversion functions

There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to sshgetfingerprinthash function. In such cases the bintobase64 function can experience an integer overflow leading to a memory under allocation, when that happens it's possibl...