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Linux Distros Unpatched Vulnerability : CVE-2026-3784

medium Nessus Plugin ID 301855

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request uses different credentials for the HTTP proxy. The proper behavior is to create or use a separate connection. (CVE-2026-3784)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-3784

https://security-tracker.debian.org/tracker/CVE-2026-3784

Plugin Details

Severity: Medium

ID: 301855

File Name: unpatched_CVE_2026_3784.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 3/11/2026

Updated: 7/6/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 7.71

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-3784

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 6.2

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

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

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:s390utils-core, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:redhat:enterprise_linux:snphost, p-cpe:/a:redhat:enterprise_linux:s390utils-iucvterm, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:centos:centos:s390utils-zdsfs, p-cpe:/a:centos:centos:s390utils-devel, p-cpe:/a:centos:centos:s390utils-osasnmpd, p-cpe:/a:redhat:enterprise_linux:libcurl-minimal, p-cpe:/a:redhat:enterprise_linux:s390utils-hmcdrvfs, p-cpe:/a:centos:centos:s390utils-cpuplugd, p-cpe:/a:redhat:enterprise_linux:s390utils-base, p-cpe:/a:redhat:enterprise_linux:s390utils-zdsfs, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:redhat:enterprise_linux:s390utils-chreipl-fcp-mpath, p-cpe:/a:redhat:enterprise_linux:s390utils-mon_statd, p-cpe:/a:centos:centos:trustee-guest-components, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:s390utils-core, p-cpe:/a:centos:centos:s390utils, p-cpe:/a:redhat:enterprise_linux:s390utils-ziomon, cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:curl, p-cpe:/a:redhat:enterprise_linux:libcurl-devel, p-cpe:/a:redhat:enterprise_linux:s390utils-cpuplugd, p-cpe:/a:centos:centos:s390utils-iucvterm, p-cpe:/a:centos:centos:snphost, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:centos:centos:s390utils-cpacfstatsd, p-cpe:/a:debian:debian_linux:curl, p-cpe:/a:redhat:enterprise_linux:s390utils-se-data, p-cpe:/a:redhat:enterprise_linux:s390utils-cmsfs-fuse, p-cpe:/a:centos:centos:libcurl-minimal, p-cpe:/a:centos:centos:s390utils-ziomon, p-cpe:/a:redhat:enterprise_linux:libcurl, p-cpe:/a:centos:centos:s390utils-hmcdrvfs, p-cpe:/a:redhat:enterprise_linux:trustee-guest-components, cpe:/o:centos:centos:7, p-cpe:/a:redhat:enterprise_linux:s390utils, p-cpe:/a:centos:centos:s390utils-se-data, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:centos:centos:curl, p-cpe:/a:centos:centos:s390utils-base, p-cpe:/a:centos:centos:s390utils-cmsfs-fuse, p-cpe:/a:centos:centos:s390utils-mon_statd, p-cpe:/a:redhat:enterprise_linux:curl-minimal, p-cpe:/a:redhat:enterprise_linux:s390utils-devel, p-cpe:/a:redhat:enterprise_linux:s390utils-osasnmpd, p-cpe:/a:centos:centos:libcurl, p-cpe:/a:centos:centos:s390utils-chreipl-fcp-mpath, p-cpe:/a:centos:centos:libcurl-devel, p-cpe:/a:redhat:enterprise_linux:s390utils-cpacfstatsd, p-cpe:/a:centos:centos:curl-minimal

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 3/11/2026

Reference Information

CVE: CVE-2026-3784