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Linux Distros Unpatched Vulnerability : CVE-2026-1299
medium Nessus Plugin ID 296421
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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.- The email module, specifically the BytesGenerator class, didn't properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized. This is only applicable if using LiteralHeader writing headers that don't respect email folding rules, the new behavior will reject the incorrectly folded headers in BytesGenerator. (CVE-2026-1299)
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-2026-1299
Plugin Details
Severity: Medium
ID: 296421
File Name: unpatched_CVE_2026_1299.nasl
Version: 1.7
Type: local
Agent: unix
Family: Misc.
Published: 1/23/2026
Updated: 2/10/2026
Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.0
CVSS v2
Risk Factor: Medium
Base Score: 4
Temporal Score: 3.4
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:N
CVSS Score Source: CVE-2026-1299
CVSS v3
Risk Factor: High
Base Score: 7.1
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C
CVSS v4
Risk Factor: Medium
Base Score: 6
Threat Score: 2.3
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Vulnerability Information
CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:pypy3, p-cpe:/a:debian:debian_linux:python3.11, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:python3.13, cpe:/o:debian:debian_linux:14.0, p-cpe:/a:canonical:ubuntu_linux:python3.14, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:canonical:ubuntu_linux:python3.13, p-cpe:/a:canonical:ubuntu_linux:python3.12, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:pypy3, p-cpe:/a:canonical:ubuntu_linux:python3.11, p-cpe:/a:canonical:ubuntu_linux:python3.10, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:python3.9, p-cpe:/a:canonical:ubuntu_linux:python3.8, p-cpe:/a:canonical:ubuntu_linux:python3.7, p-cpe:/a:canonical:ubuntu_linux:python3.6, p-cpe:/a:canonical:ubuntu_linux:python3.5, p-cpe:/a:canonical:ubuntu_linux:python3.4, p-cpe:/a:canonical:ubuntu_linux:python2.7, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:redhat:enterprise_linux:python3-tkinter, p-cpe:/a:redhat:enterprise_linux:python3, p-cpe:/a:redhat:enterprise_linux:python3-debug, p-cpe:/a:redhat:enterprise_linux:python3-devel, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:python-unversioned-command, p-cpe:/a:redhat:enterprise_linux:python3.11, p-cpe:/a:redhat:enterprise_linux:python3.11-debug, p-cpe:/a:redhat:enterprise_linux:python3.11-devel, p-cpe:/a:redhat:enterprise_linux:python3.11-idle, p-cpe:/a:redhat:enterprise_linux:python3.11-libs, p-cpe:/a:redhat:enterprise_linux:python3.11-rpm-macros, p-cpe:/a:redhat:enterprise_linux:python3.11-test, p-cpe:/a:redhat:enterprise_linux:python3.11-tkinter, p-cpe:/a:redhat:enterprise_linux:python3.9, p-cpe:/a:redhat:enterprise_linux:python3.12, p-cpe:/a:redhat:enterprise_linux:python3.12-debug, p-cpe:/a:redhat:enterprise_linux:python3.12-devel, p-cpe:/a:redhat:enterprise_linux:python3.12-idle, p-cpe:/a:redhat:enterprise_linux:python3.12-libs, p-cpe:/a:redhat:enterprise_linux:python3.12-rpm-macros, p-cpe:/a:redhat:enterprise_linux:python3.12-test, p-cpe:/a:redhat:enterprise_linux:python3.12-tkinter, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:redhat:enterprise_linux:python3.14, cpe:/o:redhat:enterprise_linux:6, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:python, p-cpe:/a:redhat:enterprise_linux:python-debug, p-cpe:/a:redhat:enterprise_linux:python-devel, p-cpe:/a:redhat:enterprise_linux:python-libs, p-cpe:/a:redhat:enterprise_linux:python-test, p-cpe:/a:redhat:enterprise_linux:python-tools, p-cpe:/a:redhat:enterprise_linux:tkinter, p-cpe:/a:redhat:enterprise_linux:python3-idle, p-cpe:/a:redhat:enterprise_linux:python3-libs, p-cpe:/a:redhat:enterprise_linux:python3-test, cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:python, p-cpe:/a:centos:centos:python-devel, p-cpe:/a:centos:centos:python-tools, p-cpe:/a:centos:centos:tkinter, p-cpe:/a:centos:centos:python-libs, p-cpe:/a:centos:centos:python-test, p-cpe:/a:centos:centos:python-debug, p-cpe:/a:centos:centos:python3, p-cpe:/a:centos:centos:python3-debug, p-cpe:/a:centos:centos:python3-devel, p-cpe:/a:centos:centos:python3-idle, p-cpe:/a:centos:centos:python3-libs, p-cpe:/a:centos:centos:python3-test, p-cpe:/a:centos:centos:python3-tkinter, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:python3.11, p-cpe:/a:centos:centos:python3.11-debug, p-cpe:/a:centos:centos:python3.11-devel, p-cpe:/a:centos:centos:python3.11-idle, p-cpe:/a:centos:centos:python3.11-libs, p-cpe:/a:centos:centos:python3.11-rpm-macros, p-cpe:/a:centos:centos:python3.11-test, p-cpe:/a:centos:centos:python3.11-tkinter, p-cpe:/a:centos:centos:python3.9, p-cpe:/a:centos:centos:python-unversioned-command, p-cpe:/a:centos:centos:python3.12, p-cpe:/a:centos:centos:python3.12-debug, p-cpe:/a:centos:centos:python3.12-devel, p-cpe:/a:centos:centos:python3.12-idle, p-cpe:/a:centos:centos:python3.12-libs, p-cpe:/a:centos:centos:python3.12-rpm-macros, p-cpe:/a:centos:centos:python3.12-test, p-cpe:/a:centos:centos:python3.12-tkinter, p-cpe:/a:centos:centos:python3.14
Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 1/23/2026
Reference Information
CVE: CVE-2026-1299