Detections
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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: 1.4

Type: local

Agent: unix

Family: Misc.

Published: 3/11/2026

Updated: 3/19/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.3

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:rust-lldb, p-cpe:/a:redhat:enterprise_linux:s390utils, p-cpe:/a:centos:centos:rust-analysis, p-cpe:/a:centos:centos:libcurl-devel, p-cpe:/a:centos:centos:rust-debugger-common, p-cpe:/a:centos:centos:s390utils-cpuplugd, p-cpe:/a:redhat:enterprise_linux:s390utils-devel, p-cpe:/a:redhat:enterprise_linux:curl-minimal, p-cpe:/a:centos:centos:s390utils-iucvterm, p-cpe:/a:centos:centos:libcurl-minimal, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:redhat:enterprise_linux:s390utils-mon_statd, p-cpe:/a:centos:centos:rust-toolset-srpm-macros, p-cpe:/a:redhat:enterprise_linux:rust-toolset, p-cpe:/a:redhat:enterprise_linux:s390utils-core, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:rust-doc, p-cpe:/a:centos:centos:s390utils-cpacfstatsd, p-cpe:/a:centos:centos:libcurl, p-cpe:/a:centos:centos:clippy, p-cpe:/a:redhat:enterprise_linux:rust-toolset-srpm-macros, p-cpe:/a:redhat:enterprise_linux:rust, p-cpe:/a:centos:centos:s390utils-cmsfs-fuse, p-cpe:/a:centos:centos:rust-analyzer, p-cpe:/a:debian:debian_linux:curl, p-cpe:/a:redhat:enterprise_linux:trustee, p-cpe:/a:redhat:enterprise_linux:rust-std-static-wasm32-wasip1, p-cpe:/a:redhat:enterprise_linux:rust-std-static-wasm32-wasi, p-cpe:/a:centos:centos:curl, p-cpe:/a:redhat:enterprise_linux:s390utils-ziomon, p-cpe:/a:redhat:enterprise_linux:curl, cpe:/o:centos:centos:7, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:rust-std-static-x86_64-unknown-none, p-cpe:/a:centos:centos:s390utils-osasnmpd, p-cpe:/a:redhat:enterprise_linux:rust-analyzer, p-cpe:/a:redhat:enterprise_linux:libcurl-devel, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:redhat:enterprise_linux:libcurl, p-cpe:/a:redhat:enterprise_linux:rust-doc, p-cpe:/a:redhat:enterprise_linux:s390utils-cpacfstatsd, p-cpe:/a:redhat:enterprise_linux:s390utils-iucvterm, p-cpe:/a:centos:centos:rust-toolset, p-cpe:/a:centos:centos:rustfmt, p-cpe:/a:redhat:enterprise_linux:rust-src, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:centos:centos:curl-minimal, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:centos:centos:s390utils-zdsfs, p-cpe:/a:redhat:enterprise_linux:s390utils-hmcdrvfs, p-cpe:/a:redhat:enterprise_linux:s390utils-base, p-cpe:/a:centos:centos:s390utils-ziomon, p-cpe:/a:centos:centos:rust-std-static-wasm32-wasi, p-cpe:/a:centos:centos:s390utils, p-cpe:/a:redhat:enterprise_linux:cargo, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:libcurl-minimal, p-cpe:/a:centos:centos:trustee, p-cpe:/a:centos:centos:rust-src, p-cpe:/a:centos:centos:rust-gdb, p-cpe:/a:centos:centos:s390utils-core, p-cpe:/a:centos:centos:s390utils-mon_statd, p-cpe:/a:redhat:enterprise_linux:s390utils-zdsfs, p-cpe:/a:redhat:enterprise_linux:s390utils-se-data, p-cpe:/a:redhat:enterprise_linux:rust-std-static-aarch64-unknown-none-softfloat, p-cpe:/a:centos:centos:s390utils-hmcdrvfs, p-cpe:/a:redhat:enterprise_linux:rust-std-static-wasm32-unknown-unknown, p-cpe:/a:redhat:enterprise_linux:rust-debugger-common, p-cpe:/a:centos:centos:rust, p-cpe:/a:redhat:enterprise_linux:s390utils-chreipl-fcp-mpath, p-cpe:/a:centos:centos:rust-lldb, p-cpe:/a:redhat:enterprise_linux:rust-analysis, p-cpe:/a:redhat:enterprise_linux:s390utils-cpuplugd, p-cpe:/a:redhat:enterprise_linux:trustee-guest-components, p-cpe:/a:redhat:enterprise_linux:rustfmt, p-cpe:/a:centos:centos:s390utils-devel, p-cpe:/a:redhat:enterprise_linux:snphost, p-cpe:/a:redhat:enterprise_linux:rust-std-static, p-cpe:/a:redhat:enterprise_linux:clippy, p-cpe:/a:centos:centos:rust-std-static-x86_64-unknown-none, p-cpe:/a:centos:centos:s390utils-chreipl-fcp-mpath, p-cpe:/a:redhat:enterprise_linux:s390utils-osasnmpd, p-cpe:/a:centos:centos:rust-std-static-aarch64-unknown-none-softfloat, p-cpe:/a:centos:centos:s390utils-base, p-cpe:/a:centos:centos:trustee-guest-components, p-cpe:/a:centos:centos:s390utils-se-data, p-cpe:/a:centos:centos:rust-std-static, p-cpe:/a:centos:centos:cargo, p-cpe:/a:centos:centos:rust-std-static-wasm32-unknown-unknown, p-cpe:/a:centos:centos:rust-std-static-wasm32-wasip1, cpe:/o:debian:debian_linux:12.0, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:rust-gdb, p-cpe:/a:centos:centos:snphost, p-cpe:/a:redhat:enterprise_linux:s390utils-cmsfs-fuse

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