Detections
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RHEL 10 : emacs (RHSA-2026:84591)

medium Nessus Plugin ID 367217

Synopsis

The remote Red Hat host is missing one or more security updates for emacs.

Description

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:84591 advisory.

 GNU Emacs is a powerful, customizable, self-documenting text editor. It provides special code editing features, a scripting language (elisp), and the capability to read e-mail and news.

 Security Fix(es):

 * emacs: GNU Emacs: Heap over-read leading to information disclosure via crafted image (CVE-2026-77219)

 * emacs: emacs: Command injection via crafted filenames in TRAMP (CVE-2026-79992)

 * emacs: Emacs: arbitrary code execution in Flymake mode (CVE-2026-96442)

 For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL emacs package based on the guidance in RHSA-2026:84591.

See Also

https://access.redhat.com/errata/RHSA-2026:84591

https://access.redhat.com/security/updates/classification/#important

https://bugzilla.redhat.com/show_bug.cgi?id=2521196

https://bugzilla.redhat.com/show_bug.cgi?id=2523665

https://bugzilla.redhat.com/show_bug.cgi?id=2537347

http://www.nessus.org/u?6d2c8ebc

Plugin Details

Severity: Medium

ID: 367217

File Name: redhat-RHSA-2026-84591.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/19/2026

Updated: 10/19/2026

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

Risk Information

VPR

Risk Factor: High

Score: 7.6

Percentile: 98.22

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-96442

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 4.5

Threat Vector: CVSS:4.0/E:U

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

CVSS Score Source: CVE-2026-77219

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:10.2, p-cpe:/a:redhat:enterprise_linux:emacs-common, p-cpe:/a:redhat:enterprise_linux:emacs-filesystem, p-cpe:/a:redhat:enterprise_linux:emacs-lucid, p-cpe:/a:redhat:enterprise_linux:emacs-nw, p-cpe:/a:redhat:enterprise_linux:emacs

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 10/19/2026

Vulnerability Publication Date: 8/21/2026

Reference Information

CVE: CVE-2026-77219, CVE-2026-79992, CVE-2026-96442

CWE: 125, 78, 94

RHSA: 2026:84591