For the stable distribution (stretch), these problems have been fixed in
version 1.7.0-1+deb9u1.
We recommend that you upgrade your libssh2 packages.
For the detailed security status of libssh2 please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/source-package/libssh2
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
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