CVE-2025-4877 Write beyond bounds in binary to base64 conversion functions CVE-2025-4878 Use of uninitialized variable in privatekeyfromfile() CVE-2025-5318 Likely read beyond bounds in sftp server handle management CVE-2025-5351 Double free in functions exporting keys CVE-2025-5372 ssh_kdf() returns a success code on certain failures CVE-2025-5449 Likely read beyond bounds in sftp server message decoding CVE-2025-5987 Invalid return code for chacha20 poly1305 with OpenSSL backend