Curl 7.33.0 < 8.19.0 Token Leak with Redirect and Netrc

medium Nessus Plugin ID 302778

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Synopsis

The remote host has a program that is affected by a token leak with redirect and netrc vulnerability

Description

The version of curl installed on the remote host is 7.33.0 prior to 8.19.0. It is, therefore, affected by a token leak with redirect and netrc vulnerability:

- When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances. If the hostname that the first request is redirected to has information in the used .netrc file, with either of the `machine` or `default` keywords, curl would pass on the bearer token set for the first host also to the second one. (CVE-2026-3783)

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 8.19.0 or later

Plugin Details

Severity: Medium

ID: 302778

File Name: curl_CVE-2026-3783.nasl

Version: 1.2

Type: local

Agent: windows, macosx, unix

Family: Misc.

Published: 3/17/2026

Updated: 3/18/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.9

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: installed_sw/Curl

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/11/2026

Vulnerability Publication Date: 3/11/2026

Reference Information

CVE: CVE-2026-3783

IAVA: 2026-A-0237

Detections

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