Detections
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libcurl 8.11.1 < 8.21.0 Netrc Wrong User Password Leak (CVE-2026-8926)

critical Nessus Plugin ID 326235

Synopsis

The remote host has a library that is affected by a credential leak vulnerability.

Description

The version of libcurl installed on the remote host is 8.11.1 prior to 8.21.0. It is, therefore, affected by a credential leak vulnerability:

 - When asking curl to use a .netrc file to find credentials and at the same time specifying a URL with a username (without a password), curl could wrongly get and use the password for another user set in the .netrc file for that host if such a one exists and there is no match for the specified user.
 (CVE-2026-8926)

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

Solution

Upgrade libcurl to version 8.21.0 or later.

See Also

https://curl.se/docs/CVE-2026-8926.html

Plugin Details

Severity: Critical

ID: 326235

File Name: libcurl_CVE-2026-8926.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 7/10/2026

Updated: 7/10/2026

Configuration: Enable thorough checks (optional)

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.66

CVSS v2

Risk Factor: High

Base Score: 9.4

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

CVSS Score Source: CVE-2026-8926

CVSS v3

Risk Factor: Critical

Base Score: 9.1

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

Vulnerability Information

CPE: cpe:/a:haxx:libcurl

Required KB Items: installed_sw/libcurl

Patch Publication Date: 6/24/2026

Vulnerability Publication Date: 6/24/2026

Reference Information

CVE: CVE-2026-8926

IAVA: 2026-A-0627