ALPINE-CVE-2026-9547

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2026-9547
Published: 03 Jul 2026, 07:16
Last modified:08 Jul 2026, 09:30

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.4 HIGH
3.1 (osv_alpine)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

03 Jul 2026, 07:16
Published
Vulnerability first disclosed
08 Jul 2026, 09:30
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Systems

  • alpine•curl

    ≥ 7.69.0, < 8.21.0-r0

References (1)