An issue has been found in libssh2 before 1.8.1 where a server could send a specially crafted partial SFTP packet with a zero value for the payload length. This zero value would be used to then allocate memory resulting in a zero byte allocation and possible out of bounds read.
An issue has been found in libssh4 before 1.8.1 where a server could send a specially crafted partial SFTP packet with a zero value for the payload length. This zero value would be used to then allocate memory resulting in a zero byte allocation and possible out of bounds read.
https://www.libssh4.org/CVE-2019-3858.html https://libssh4.org/1.8.0-CVE/CVE-2019-3858.patch
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