CVE-2026-9547 (GCVE-0-2026-9547)

Vulnerability from cvelistv5 – Published: 2026-07-03 06:18 – Updated: 2026-07-03 06:18
VLAI
Title
SSH improper host validation
Summary
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.
Severity
No CVSS data available.
Assigner
Impacted products
Vendor Product Version
curl curl Affected: 8.20.0 , ≤ 8.20.0 (semver)
Affected: 8.19.0 , ≤ 8.19.0 (semver)
Affected: 8.18.0 , ≤ 8.18.0 (semver)
Affected: 8.17.0 , ≤ 8.17.0 (semver)
Affected: 8.16.0 , ≤ 8.16.0 (semver)
Affected: 8.15.0 , ≤ 8.15.0 (semver)
Affected: 8.14.1 , ≤ 8.14.1 (semver)
Affected: 8.14.0 , ≤ 8.14.0 (semver)
Affected: 8.13.0 , ≤ 8.13.0 (semver)
Affected: 8.12.1 , ≤ 8.12.1 (semver)
Affected: 8.12.0 , ≤ 8.12.0 (semver)
Affected: 8.11.1 , ≤ 8.11.1 (semver)
Affected: 8.11.0 , ≤ 8.11.0 (semver)
Affected: 8.10.1 , ≤ 8.10.1 (semver)
Affected: 8.10.0 , ≤ 8.10.0 (semver)
Affected: 8.9.1 , ≤ 8.9.1 (semver)
Affected: 8.9.0 , ≤ 8.9.0 (semver)
Affected: 8.8.0 , ≤ 8.8.0 (semver)
Affected: 8.7.1 , ≤ 8.7.1 (semver)
Affected: 8.7.0 , ≤ 8.7.0 (semver)
Affected: 8.6.0 , ≤ 8.6.0 (semver)
Affected: 8.5.0 , ≤ 8.5.0 (semver)
Affected: 8.4.0 , ≤ 8.4.0 (semver)
Affected: 8.3.0 , ≤ 8.3.0 (semver)
Affected: 8.2.1 , ≤ 8.2.1 (semver)
Affected: 8.2.0 , ≤ 8.2.0 (semver)
Affected: 8.1.2 , ≤ 8.1.2 (semver)
Affected: 8.1.1 , ≤ 8.1.1 (semver)
Affected: 8.1.0 , ≤ 8.1.0 (semver)
Affected: 8.0.1 , ≤ 8.0.1 (semver)
Affected: 8.0.0 , ≤ 8.0.0 (semver)
Affected: 7.88.1 , ≤ 7.88.1 (semver)
Affected: 7.88.0 , ≤ 7.88.0 (semver)
Affected: 7.87.0 , ≤ 7.87.0 (semver)
Affected: 7.86.0 , ≤ 7.86.0 (semver)
Affected: 7.85.0 , ≤ 7.85.0 (semver)
Affected: 7.84.0 , ≤ 7.84.0 (semver)
Affected: 7.83.1 , ≤ 7.83.1 (semver)
Affected: 7.83.0 , ≤ 7.83.0 (semver)
Affected: 7.82.0 , ≤ 7.82.0 (semver)
Affected: 7.81.0 , ≤ 7.81.0 (semver)
Affected: 7.80.0 , ≤ 7.80.0 (semver)
Affected: 7.79.1 , ≤ 7.79.1 (semver)
Affected: 7.79.0 , ≤ 7.79.0 (semver)
Affected: 7.78.0 , ≤ 7.78.0 (semver)
Affected: 7.77.0 , ≤ 7.77.0 (semver)
Affected: 7.76.1 , ≤ 7.76.1 (semver)
Affected: 7.76.0 , ≤ 7.76.0 (semver)
Affected: 7.75.0 , ≤ 7.75.0 (semver)
Affected: 7.74.0 , ≤ 7.74.0 (semver)
Affected: 7.73.0 , ≤ 7.73.0 (semver)
Affected: 7.72.0 , ≤ 7.72.0 (semver)
Affected: 7.71.1 , ≤ 7.71.1 (semver)
Affected: 7.71.0 , ≤ 7.71.0 (semver)
Affected: 7.70.0 , ≤ 7.70.0 (semver)
Affected: 7.69.1 , ≤ 7.69.1 (semver)
Affected: 7.69.0 , ≤ 7.69.0 (semver)
Create a notification for this product.
Credits
Joshua Rogers (Aisle Research) Joshua Rogers (Aisle Research)
Show details on NVD website

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              "description": "CWE-297 Improper Validation of Certificate with Host Mismatch",
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Instead of rejecting the mismatch, the callback\\nmechanism fails to properly enforce the restriction, allowing the connection\\nto succeed without warning and risking a potential man-in-the-middle attack.\"}],\"affected\":[{\"source\":\"2499f714-1537-4658-8207-48ae4bb9eae9\",\"affectedData\":[{\"vendor\":\"curl\",\"product\":\"curl\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"8.20.0\",\"lessThanOrEqual\":\"8.20.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.19.0\",\"lessThanOrEqual\":\"8.19.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.18.0\",\"lessThanOrEqual\":\"8.18.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.17.0\",\"lessThanOrEqual\":\"8.17.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.16.0\",\"lessThanOrEqual\":\"8.16.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.15.0\",\"lessThanOrEqual\":\"8.15.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.14.1\",\"lessThanOrEqual\":\"8.14.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.14.0\",\"lessThanOrEqual\":\"8.14.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.13.0\",\"lessThanOrEqual\":\"8.13.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.12.1\",\"lessThanOrEqual\":\"8.12.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.12.0\",\"lessThanOrEqual\":\"8.12.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.11.1\",\"lessThanOrEqual\":\"8.11.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.11.0\",\"lessThanOrEqual\":\"8.11.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.10.1\",\"lessThanOrEqual\":\"8.10.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.10.0\",\"lessThanOrEqual\":\"8.10.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.9.1\",\"lessThanOrEqual\":\"8.9.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.9.0\",\"lessThanOrEqual\":\"8.9.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.8.0\",\"lessThanOrEqual\":\"8.8.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.7.1\",\"lessThanOrEqual\":\"8.7.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.7.0\",\"lessThanOrEqual\":\"8.7.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.6.0\",\"lessThanOrEqual\":\"8.6.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.5.0\",\"lessThanOrEqual\":\"8.5.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.4.0\",\"lessThanOrEqual\":\"8.4.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.3.0\",\"lessThanOrEqual\":\"8.3.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.2.1\",\"lessThanOrEqual\":\"8.2.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.2.0\",\"lessThanOrEqual\":\"8.2.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.1.2\",\"lessThanOrEqual\":\"8.1.2\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.1.1\",\"lessThanOrEqual\":\"8.1.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.1.0\",\"lessThanOrEqual\":\"8.1.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.0.1\",\"lessThanOrEqual\":\"8.0.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"8.0.0\",\"lessThanOrEqual\":\"8.0.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.88.1\",\"lessThanOrEqual\":\"7.88.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.88.0\",\"lessThanOrEqual\":\"7.88.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.87.0\",\"lessThanOrEqual\":\"7.87.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.86.0\",\"lessThanOrEqual\":\"7.86.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.85.0\",\"lessThanOrEqual\":\"7.85.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.84.0\",\"lessThanOrEqual\":\"7.84.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.83.1\",\"lessThanOrEqual\":\"7.83.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.83.0\",\"lessThanOrEqual\":\"7.83.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.82.0\",\"lessThanOrEqual\":\"7.82.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.81.0\",\"lessThanOrEqual\":\"7.81.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.80.0\",\"lessThanOrEqual\":\"7.80.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.79.1\",\"lessThanOrEqual\":\"7.79.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.79.0\",\"lessThanOrEqual\":\"7.79.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.78.0\",\"lessThanOrEqual\":\"7.78.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.77.0\",\"lessThanOrEqual\":\"7.77.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.76.1\",\"lessThanOrEqual\":\"7.76.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.76.0\",\"lessThanOrEqual\":\"7.76.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.75.0\",\"lessThanOrEqual\":\"7.75.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.74.0\",\"lessThanOrEqual\":\"7.74.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.73.0\",\"lessThanOrEqual\":\"7.73.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.72.0\",\"lessThanOrEqual\":\"7.72.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.71.1\",\"lessThanOrEqual\":\"7.71.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.71.0\",\"lessThanOrEqual\":\"7.71.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.70.0\",\"lessThanOrEqual\":\"7.70.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.69.1\",\"lessThanOrEqual\":\"7.69.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.69.0\",\"lessThanOrEqual\":\"7.69.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://curl.se/docs/CVE-2026-9547.html\",\"source\":\"2499f714-1537-4658-8207-48ae4bb9eae9\"},{\"url\":\"https://curl.se/docs/CVE-2026-9547.json\",\"source\":\"2499f714-1537-4658-8207-48ae4bb9eae9\"},{\"url\":\"https://hackerone.com/reports/3751712\",\"source\":\"2499f714-1537-4658-8207-48ae4bb9eae9\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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