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Linux Distros Unpatched Vulnerability : CVE-2026-42245

low Nessus Plugin ID 315718

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.

 - Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, Net::IMAP::ResponseReader has quadratic time complexity when reading large responses containing many string literals. A hostile server can send responses which are crafted to exhaust the client's CPU for a denial of service attack. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4. (CVE-2026-42245)

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-2026-42245

https://security-tracker.debian.org/tracker/CVE-2026-42245

https://ubuntu.com/security/CVE-2026-42245

Plugin Details

Severity: Low

ID: 315718

File Name: unpatched_CVE_2026_42245.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Misc.

Published: 5/20/2026

Updated: 5/21/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.6

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

CVSS Score Source: CVE-2026-42245

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.9

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

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

CVSS v4

Risk Factor: Low

Base Score: 2.3

Threat Score: 0.6

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:redhat:enterprise_linux:8, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:centos:centos:ruby, p-cpe:/a:centos:centos:ruby-devel, p-cpe:/a:centos:centos:ruby-libs, p-cpe:/a:centos:centos:ruby-irb, p-cpe:/a:centos:centos:ruby-doc, p-cpe:/a:centos:centos:rubygem-bigdecimal, p-cpe:/a:centos:centos:rubygem-io-console, p-cpe:/a:centos:centos:rubygem-json, p-cpe:/a:centos:centos:rubygem-minitest, p-cpe:/a:centos:centos:rubygem-psych, p-cpe:/a:centos:centos:rubygem-rake, p-cpe:/a:centos:centos:rubygem-rdoc, p-cpe:/a:centos:centos:rubygems, p-cpe:/a:centos:centos:rubygems-devel, p-cpe:/a:centos:centos:rubygem-bundler, p-cpe:/a:centos:centos:rubygem-bundler-doc, p-cpe:/a:redhat:enterprise_linux:ruby, p-cpe:/a:redhat:enterprise_linux:ruby-devel, p-cpe:/a:redhat:enterprise_linux:ruby-libs, p-cpe:/a:redhat:enterprise_linux:rubygem-json, p-cpe:/a:redhat:enterprise_linux:rubygem-rake, p-cpe:/a:redhat:enterprise_linux:rubygems, p-cpe:/a:redhat:enterprise_linux:ruby-irb, p-cpe:/a:redhat:enterprise_linux:rubygem-rdoc, p-cpe:/a:redhat:enterprise_linux:ruby-doc, p-cpe:/a:redhat:enterprise_linux:rubygem-bigdecimal, p-cpe:/a:redhat:enterprise_linux:rubygem-io-console, p-cpe:/a:redhat:enterprise_linux:rubygem-minitest, p-cpe:/a:redhat:enterprise_linux:rubygem-psych, p-cpe:/a:redhat:enterprise_linux:rubygems-devel, p-cpe:/a:redhat:enterprise_linux:rubygem-bson, p-cpe:/a:redhat:enterprise_linux:rubygem-bundler, p-cpe:/a:redhat:enterprise_linux:rubygem-test-unit, p-cpe:/a:redhat:enterprise_linux:rubygem-bundler-doc, p-cpe:/a:redhat:enterprise_linux:rubygem-mongo, p-cpe:/a:redhat:enterprise_linux:rubygem-mongo-doc, p-cpe:/a:redhat:enterprise_linux:rubygem-abrt, p-cpe:/a:redhat:enterprise_linux:rubygem-abrt-doc, p-cpe:/a:redhat:enterprise_linux:rubygem-bson-doc, p-cpe:/a:redhat:enterprise_linux:rubygem-did_you_mean, p-cpe:/a:redhat:enterprise_linux:rubygem-mysql2, p-cpe:/a:redhat:enterprise_linux:rubygem-mysql2-doc, p-cpe:/a:redhat:enterprise_linux:rubygem-net-telnet, p-cpe:/a:redhat:enterprise_linux:rubygem-openssl, p-cpe:/a:redhat:enterprise_linux:rubygem-pg, p-cpe:/a:redhat:enterprise_linux:rubygem-pg-doc, p-cpe:/a:redhat:enterprise_linux:rubygem-power_assert, p-cpe:/a:redhat:enterprise_linux:rubygem-xmlrpc, p-cpe:/a:canonical:ubuntu_linux:ruby2.3, p-cpe:/a:canonical:ubuntu_linux:ruby2.5, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:rubygem-abrt, p-cpe:/a:centos:centos:rubygem-abrt-doc, p-cpe:/a:centos:centos:rubygem-bson, p-cpe:/a:centos:centos:rubygem-bson-doc, p-cpe:/a:centos:centos:rubygem-did_you_mean, p-cpe:/a:centos:centos:rubygem-mongo, p-cpe:/a:centos:centos:rubygem-mongo-doc, p-cpe:/a:centos:centos:rubygem-mysql2, p-cpe:/a:centos:centos:rubygem-mysql2-doc, p-cpe:/a:centos:centos:rubygem-net-telnet, p-cpe:/a:centos:centos:rubygem-openssl, p-cpe:/a:centos:centos:rubygem-pg, p-cpe:/a:centos:centos:rubygem-pg-doc, p-cpe:/a:centos:centos:rubygem-power_assert, p-cpe:/a:centos:centos:rubygem-test-unit, p-cpe:/a:centos:centos:rubygem-xmlrpc, p-cpe:/a:canonical:ubuntu_linux:ruby2.7, p-cpe:/a:redhat:enterprise_linux:rubygem-irb, p-cpe:/a:redhat:enterprise_linux:ruby-default-gems, p-cpe:/a:centos:centos:ruby-default-gems, p-cpe:/a:centos:centos:rubygem-irb, p-cpe:/a:debian:debian_linux:ruby2.7, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:ruby3.0, cpe:/o:redhat:enterprise_linux:9, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:redhat:enterprise_linux:rubygem-rbs, p-cpe:/a:redhat:enterprise_linux:rubygem-rexml, p-cpe:/a:redhat:enterprise_linux:rubygem-rss, p-cpe:/a:redhat:enterprise_linux:rubygem-typeprof, p-cpe:/a:centos:centos:rubygem-rbs, p-cpe:/a:centos:centos:rubygem-rexml, p-cpe:/a:centos:centos:rubygem-rss, p-cpe:/a:centos:centos:rubygem-typeprof, p-cpe:/a:redhat:enterprise_linux:ruby-bundled-gems, p-cpe:/a:debian:debian_linux:ruby3.1, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:redhat:enterprise_linux:rubygem-racc, p-cpe:/a:canonical:ubuntu_linux:ruby3.2, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:canonical:ubuntu_linux:ruby3.3, p-cpe:/a:debian:debian_linux:ruby3.3, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:canonical:ubuntu_linux:jruby, p-cpe:/a:centos:centos:ruby-bundled-gems, p-cpe:/a:centos:centos:rubygem-racc, cpe:/o:debian:debian_linux:14.0, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:centos:centos:ruby4.0, p-cpe:/a:redhat:enterprise_linux:ruby4.0, cpe:/o:canonical:ubuntu_linux:26.04

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 5/4/2026

Reference Information

CVE: CVE-2026-42245