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CVE-2026-9547

SSH improper host validation

High7.4EPSS 0.36%
Published
Updated
Reserved
Assigned by
curl

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.

Scores

CVSS scores of CVE-2026-9547, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVDNVD · Modified3.1High7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS (exploitation in 30 days)
0.36% · top 70% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.

Weakness

Affected products

  • curl · curl

    • affected 7.69.0 – < 8.14.2
    • affected 8.15.0 – < 8.16.1
    • affected 8.17.0 – < 8.20.1

  • curl · curl

    • affected 507cf6a13db0375eadd4655b4c64710db29e9cf2 – < 0b8dbbc63c98777e4584cb9fbd71df3464008ad1

  • curl · curl

    • affected 8.20.0
    • affected 8.19.0
    • affected 8.18.0
    • affected 8.17.0
    • affected 8.16.0
    • affected 8.15.0
    • affected 8.14.1
    • affected 8.14.0
    • affected 8.13.0
    • affected 8.12.1
    • affected 8.12.0
    • affected 8.11.1
    • affected 8.11.0
    • affected 8.10.1
    • affected 8.10.0
    • affected 8.9.1
    • affected 8.9.0
    • affected 8.8.0
    • affected 8.7.1
    • affected 8.7.0
    • affected 8.6.0
    • affected 8.5.0
    • affected 8.4.0
    • affected 8.3.0
    • affected 8.2.1
    • affected 8.2.0
    • affected 8.1.2
    • affected 8.1.1
    • affected 8.1.0
    • affected 8.0.1
    • affected 8.0.0
    • affected 7.88.1
    • affected 7.88.0
    • affected 7.87.0
    • affected 7.86.0
    • affected 7.85.0
    • affected 7.84.0
    • affected 7.83.1
    • affected 7.83.0
    • affected 7.82.0
    • and 17 more

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-9547 badge
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Record last updated .