libcurl 7.44.0 < 8.22.0 HTTP/2 Server Push Use-After-Free

medium Nessus Plugin ID 342617

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Synopsis

The remote host has a program that is affected by a use-after-free vulnerability.

Description

The version of libcurl installed on the remote host is 7.44.0 prior to 8.22.0. It is, therefore, affected by a use-after-free vulnerability:

- A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process. (CVE-2026-18924)

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 8.22.0 or later.

Plugin Details

Severity: Medium

ID: 342617

File Name: libcurl_CVE-2026-18924.nasl

Version: 1.5

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 9/3/2026

Updated: 9/16/2026

Configuration: Enable thorough checks (optional)

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.39

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.2

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

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

CVSS Score Source: CVE-2026-18924

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 2.9

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/a:haxx:libcurl

Required KB Items: installed_sw/libcurl

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/2/2026

Vulnerability Publication Date: 9/2/2026

Reference Information

CVE: CVE-2026-18924

IAVA: 2026-A-0932

Detections

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