This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-87865 →

UBUNTU-CVE-2026-87865

When libcurl uses libssh2 with a hashed `known_hosts` file, an unrelated initial entry can cause host key validation to report a key mismatch as a *...

Original description

The description as published by the source.

When libcurl uses libssh2 with a hashed known_hosts file, an unrelated initial entry can cause host key validation to report a key mismatch as a missing key to the CURLOPT_SSH_KEYFUNCTION callback.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Ubuntu:26.10 curl

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:26.04:LTS curl

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.18.0-1ubuntu2.8"}]}]

References

advisory ubuntu.com
report ubuntu.com
report cve.org
report curl.se