Vulnerability Report

CVE-2026-9547

Title: SCP/SFTP Host Key Mismatch Bypass

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-9547.

CWE Category NVD-CWE-noinfo
Published Date Jul 03, 2026
Modified Date Jul 07, 2026
Exploit Status Not Found
Score 7.4 CVSS v
Exploit Probability (EPSS)
0.51%

Vulnerability Summary

CVE-2026-9547: 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.

Impacted Vendors

H
haxx 1

Reference Links

https://curl.se/docs/CVE-2026-9547.html https://curl.se/docs/CVE-2026-9547.json https://hackerone.com/reports/3751712
CVSS v3.1
Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0
Severity HIGH
7.4
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-9547 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Stack

No specific products linked.