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The remote maximum packet size from SSH_MSG_CHANNEL_OPEN_CONFIRMATION was stored without validation and later used to allocate Buffers, so a malicious server could trigger OutOfMemoryError or NegativeArraySizeException. Cap it at PACKET_MAX_SIZE - 4096, which is always protocol-compliant as it is only an upper bound for what we send. Also guard the SFTP pipe size computation against int overflow. Reported by pyj kor. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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The remote maximum packet size from SSH_MSG_CHANNEL_OPEN_CONFIRMATION was stored without validation and later used to allocate Buffers, so a malicious server could trigger OutOfMemoryError or NegativeArraySizeException. Cap it at PACKET_MAX_SIZE - 4096, which is always protocol-compliant as it is only an upper bound for what we send. Also guard the SFTP pipe size computation against int overflow.
Reported by pyj kor.