🛡️ CVE-2026-9547 on Alpine — curl

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-9547 as tracked by Alpine, for the package curl. The fix is available in version 8.21.0-r0; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Affected software

ALPINE-CVE-2026-9547 is recorded against 1 package.

  • curl (from 7.69.0 up to 8.21.0-r0)

Timeline and source

Published on 3 July 2026 and last revised on 8 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security.alpinelinux.org (Advisory)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-07-03
Updated 2026-08-11
Modified 2026-07-08
Fix URL N/A

Affected Packages

Software From version Fixed in
curl 7.69.0 8.21.0-r0

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ALPINE-CVE-2026-9547 is rated CVSS 7.4 High. BotEraser scans your installation against known CVE records and tells you whether this vulnerability applies to the versions you actually run.

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