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CVE-2026-9547— SSH improper host validation

Quick assessment

Affected
curl curl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

curl是瑞典cURL团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl存在加密问题漏洞，该漏洞源于通过SCP://或SFTP://协议传输时使用CURLOPT_SSH_KEYFUNCTION回调函数，导致可能静默接受不受信任的服务器，存在中间人攻击风险。以下版本受到影响：7.69.0版本、7.69.1版本、7.70.0版本、7.71.0版本、7.71.1版本、7.72.0版本、7.73.0版本、7.74.0版本、7.75.0版本、7.76.0版本、7.76.1版本、7.77.0版本、

AI Predicted 5.3 Difficulty: Moderate EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 61

VendorProduct Version RangeStatus
curl curl 7.69.0< 8.14.2 affected
8.15.0< 8.16.1 affected
8.17.0< 8.20.1 affected
507cf6a13db0375eadd4655b4c64710db29e9cf2< 0b8dbbc63c98777e4584cb9fbd71df3464008ad1 affected
8.20.0 affected
8.19.0 affected
8.18.0 affected
8.17.0 affected
… +53 more rows
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I. Basic Information for CVE-2026-9547

Vulnerability Information
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Vulnerability Title
SSH improper host validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对宿主不匹配的证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
curl 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
curl是瑞典cURL团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl存在加密问题漏洞，该漏洞源于通过SCP://或SFTP://协议传输时使用CURLOPT_SSH_KEYFUNCTION回调函数，导致可能静默接受不受信任的服务器，存在中间人攻击风险。以下版本受到影响：7.69.0版本、7.69.1版本、7.70.0版本、7.71.0版本、7.71.1版本、7.72.0版本、7.73.0版本、7.74.0版本、7.75.0版本、7.76.0版本、7.76.1版本、7.77.0版本、
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
curl curl 7.69.0 ~ 8.14.2 -
curl curl 507cf6a13db0375eadd4655b4c64710db29e9cf2 ~ 0b8dbbc63c98777e4584cb9fbd71df3464008ad1 -
curl curl 8.20.0 -

II. Public POCs for CVE-2026-9547

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III. Intelligence Information for CVE-2026-9547

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Vendor Advisories for CVE-2026-9547 (2)

Proof of Concept for CVE-2026-9547 (1)

Same Patch Batch · curl · 2026-07-03 · 18 CVEs total

CVE-2026-10536 HTTP/2 stream-dependency tree UAF
CVE-2026-8932 incomplete mTLS config matching in conn reuse
CVE-2026-8458 wrong reuse for different services
CVE-2026-8925 SASL double-free
CVE-2026-8286 wrong STARTTLS connection reuse
CVE-2026-8927 env-set cross-proxy Digest auth state leak
CVE-2026-8926 password leak with netrc and user in URL
CVE-2026-8924 trailing dot domain super cookie
CVE-2026-12064 proto-default skips SSH verification
CVE-2026-11352 QUIC zero-length UDP datagrams busy-loop
CVE-2026-9546 sending old referer
CVE-2026-9545 exposing HTTP/3 early data
CVE-2026-9080 UAF after pause in socket callback
CVE-2026-9079 stale proxy password leak
CVE-2026-11564 Native CA trust persist
CVE-2026-11856 cross-origin Digest auth state leak
CVE-2026-11586 WS Auto-PONG memory exhaustion

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl
Same weakness: CWE-297

V. Comments for CVE-2026-9547

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