Detections
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Curl 8.17.0 < 8.20.0 OCSP Stapling Bypass

medium Nessus Plugin ID 311424

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Synopsis

The remote host has a program that is affected by an OCSP stapling bypass vulnerability

Description

The version of curl installed on the remote host is 8.17.0 prior to 8.20.0. It is, therefore, affected by an OCSP stapling bypass vulnerability:

 - When curl is told to use the Certificate Status Request TLS extension, often referred to as OCSP stapling, to verify that the server certificate is valid, it fails to detect OCSP problems and instead wrongly consider the response as fine. This flaw only manifests when curl is built with an OpenSSL-based backend while running on Apple operating systems with Apple SecTrust enabled. (CVE-2026-7009)

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 8.20.0 or later

See Also

https://curl.se/docs/CVE-2026-7009.html

Plugin Details

Severity: Medium

ID: 311424

File Name: curl_CVE-2026-7009.nasl

Version: 1.4

Type: Local

Agent: unix

Family: Misc.

Published: 5/1/2026

Updated: 5/15/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2026-7009

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.8

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:haxx:curl

Required KB Items: Host/MacOSX/Version, installed_sw/Curl

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/29/2026

Vulnerability Publication Date: 4/29/2026

Reference Information

CVE: CVE-2026-7009

IAVA: 2026-A-0397