This page tracks the Alpine Linux fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-9547 →

ALPINE-CVE-2026-9547

When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently acc...

Original description

The description as published by the source.

When a libcurl-based application performs transfers via SCP:// or SFTP://
and utilizes the CURLOPT_SSH_KEYFUNCTION callback, it may silently accept an
untrusted server. This vulnerability occurs when a server presents a host key
type that does not match the specific key type already recorded for that host
in the known_hosts file. Instead of rejecting the mismatch, the callback
mechanism fails to properly enforce the restriction, allowing the connection
to succeed without warning and risking a potential man-in-the-middle attack.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Alpine:v3.23 curl

[{"type":"ECOSYSTEM","events":[{"introduced":"7.69.0"},{"fixed":"8.22.0-r0"}]}]

Alpine:v3.24 curl

[{"type":"ECOSYSTEM","events":[{"introduced":"7.69.0"},{"fixed":"8.21.0-r0"}]}]

References

advisory security.alpinelinux.org