Detections
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Curl 7.69.1 < 8.23.0 SSH Known Hosts Validation Error

medium Nessus Plugin ID 371157

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Synopsis

The remote host has a program that is affected by a host key validation vulnerability.

Description

The version of curl installed on the remote host is 7.69.1 prior to 8.23.0. It is, therefore, affected by a host key validation vulnerability:

 - When libcurl uses libssh2 with a hashed known_hosts file, an unrelated initial entry can cause host key validation to report a key mismatch as a missing key to the CURLOPT_SSH_KEYFUNCTION callback. (CVE-2026-87865)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade Curl to version 8.23.0 or later.

See Also

https://curl.se/docs/CVE-2026-87865.html

Plugin Details

Severity: Medium

ID: 371157

File Name: curl_CVE-2026-87865.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 10/23/2026

Updated: 10/23/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

CVSS Score Rationale: Score from an analysis done by tenable

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.46

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Vulnerability Information

CPE: cpe:/a:haxx:curl

Required KB Items: installed_sw/Curl

Patch Publication Date: 10/14/2026

Vulnerability Publication Date: 10/14/2026

Reference Information

CVE: CVE-2026-87865

IAVA: 2026-A-1143