Detections
Analytics

libcurl 7.14.0 < 8.20.0 Netrc Password Leak on HTTP Redirect

high Nessus Plugin ID 311421

Synopsis

The remote host has a program that is affected by a netrc password leak vulnerability.

Description

The version of libcurl installed on the remote host is 7.14.0 prior to 8.20.0. It is, therefore, affected by a netrc password leak vulnerability:

 - When asked to both use a .netrc file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances. The issue requires that both the original and redirect destinations use unencrypted http:// URLs, both requests traverse an identical HTTP proxy, and the connection between client and proxy gets reused.
 (CVE-2026-6429)

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 8.20.0 or later

See Also

https://curl.se/docs/CVE-2026-6429.html

Plugin Details

Severity: High

ID: 311421

File Name: libcurl_CVE-2026-6429.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 5/1/2026

Updated: 5/1/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Medium

Base Score: 5

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

CVSS Score Source: CVE-2026-6429

CVSS v3

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/a:haxx:libcurl

Required KB Items: installed_sw/libcurl

Patch Publication Date: 4/29/2026

Vulnerability Publication Date: 4/29/2026

Reference Information

CVE: CVE-2026-6429

IAVA: 2026-A-0397