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curl EUVDEUVD-2026-41495

| CVE-2026-9547 HIGH
2026-06-24 GHSA-xq9p-gxg6-f7q6
Information Disclosure Curl
7.4
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
7.4 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
7.4 HIGH

Network MitM with no auth (AV:N/PR:N) but requires attacker positioning, a specific callback, and a prior key-type pin (AC:H); MitM enables read and modify of transfers (C:H/I:H), no availability impact (A:N).

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative

Primary rating from Vendor (CNA).

CVSS VectorVendor

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

7
Analysis Updated
Jul 06, 2026 - 18:44 vuln.today
v5 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:43 vuln.today
v4 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:42 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:42 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 06, 2026 - 18:22 vuln.today
cvss_changed
CVSS changed
Jul 06, 2026 - 18:22 NVD
7.4 (HIGH)
Analysis Generated
Jun 24, 2026 - 18:30 vuln.today

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

Articles & Coverage 1

News Critical SSH Host Validation Bypass in OpenSSL - CVE-2026-9547 Jun 25, 2026

AnalysisAI

Host key verification bypass in libcurl affects applications using the CURLOPT_SSH_KEYFUNCTION callback for SCP:// or SFTP:// transfers, where a server presenting a host key of a different type than the one already recorded in known_hosts is silently accepted instead of rejected. This lets a network-positioned attacker impersonate a trusted SSH server and mount a man-in-the-middle attack, exposing and tampering with transferred data. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Gain man-in-the-middle network position
Delivery
Present mismatched host key type
Exploit
Callback fails to reject mismatch
Execution
Connection silently accepted
Impact
Intercept and tamper with SCP/SFTP data
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Vulnerability AssessmentAI

Exploitation Exploitation requires all of: (1) a libcurl-based application performing SCP:// or SFTP:// transfers; (2) that application having registered the CURLOPT_SSH_KEYFUNCTION callback rather than relying on default strict verification; (3) the target host already having an entry in the known_hosts file recorded with a specific key type; and (4) the attacker being able to present a server key of a DIFFERENT type for that host. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are internally consistent and point to a real but conditional risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can intercept traffic between a libcurl-based application and its SFTP server (e.g. on a shared LAN, via ARP/DNS spoofing, or a rogue upstream) presents a host key of a different algorithm than the one pinned in known_hosts. …
Remediation Patch available per vendor advisory (https://curl.se/docs/CVE-2026-9547.html); an exact fixed release version was not specified in the provided data, so upgrade to the latest curl/libcurl build offered by your vendor or distribution and confirm the fixed version against the advisory before deploying - for Debian/Ubuntu systems apply the packages referenced in USN-8487-1. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all applications using libcurl with SFTP/SCP transfer capability and CURLOPT_SSH_KEYFUNCTION callbacks. …

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SUSE

Severity: Important
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EUVD-2026-41495 vulnerability details – vuln.today
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