---
schema_version: '1.0'
id: security-20260709-b7cfc2
url: https://osv.dev/vulnerability/CVE-2026-9547
url_hash: b7cfc2a355b62aa6b43ba9fab8eff26ed0b1eb12ca3d6ebdef0c97ce0754548c
canonical_url: https://osv.dev/vulnerability/CVE-2026-9547
source: osv:nvd
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-9547
- severity:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- https://github.com/curl/curl
- GIT
lang: en
published_at: '2026-07-03T06:18:44Z'
fetched_at: '2026-07-09T15:38:26Z'
updated_at: '2026-07-09T15:38:50Z'
status: published
content_hash: 84182d1dfc02e42ed681099d678afd4ba28941ca97a3ed24661ab67cb96d74af
license_note: full
summary: SSH improper host validation
summary_source: rss
summary_en: SSH improper host validation
entities:
- name: CVE-2022-26925
  type: event
- name: GitHub
  type: organization
- name: GrowUpsShow
  type: organization
- name: ghost
  type: artifact
- name: Validation Started
  type: event
key_facts: []
related: []
related_auto:
- name: GitLost
  type: concept
  weight: 4.0
- name: Windowsローカルセキュリティ認証機関(LSA
  type: location
  weight: 1.0
- name: AI Agent
  type: concept
  weight: 1.0
- name: Hy3
  type: artifact
  weight: 1.0
- name: OpenClaw
  type: artifact
  weight: 1.0
title: 'CVE-2026-9547: SSH improper host validation'
---

# CVE-2026-9547: SSH improper host validation

## TL;DR
SSH improper host validation

## Key Points
- cve / CVE-2026-9547 / severity:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N / https://github.com/curl/curl / GIT

## Details
**Severity:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
**Advisory:** CVE-2026-9547

**Affected (your watchlist):**
- `GIT:https://github.com/curl/curl` curl-8_9_1 → no fixed version listed [mac]

**Details:**
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.

**References:**
- https://curl.se/docs/CVE-2026-9547.html
- https://curl.se/docs/CVE-2026-9547.json
- https://hackerone.com/reports/3751712
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9547.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-9547

_Data: OSV.dev (upstream: nvd) — https://osv.dev/vulnerability/CVE-2026-9547_

## Source
元記事: [CVE-2026-9547: SSH improper host validation](https://osv.dev/vulnerability/CVE-2026-9547) — published 2026-07-03T06:18:44Z