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RHEL 10 : expat (RHSA-2026:98582)

high Nessus Plugin ID 378871

Synopsis

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

Description

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:98582 advisory.

 Expat is a C library for parsing XML documents.

 Security Fix(es):

 * expat: Expat: Denial of Service via quadratic complexity in attribute processing (CVE-2026-66046)

 * expat: Expat: XML Injection via Malformed UTF-16 Input (CVE-2026-93990)

 * expat: expat: Denial of Service via integer overflow in expat_realloc (CVE-2026-102633)

 * expat: expat: Information disclosure via heap buffer over-read in XML_ParseBuffer (CVE-2026-77214)

 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 expat package based on the guidance in RHSA-2026:98582.

See Also

https://access.redhat.com/errata/RHSA-2026:98582

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

https://bugzilla.redhat.com/show_bug.cgi?id=2517901

https://bugzilla.redhat.com/show_bug.cgi?id=2538967

https://bugzilla.redhat.com/show_bug.cgi?id=2543288

https://bugzilla.redhat.com/show_bug.cgi?id=2547476

http://www.nessus.org/u?7bf36778

Plugin Details

Severity: High

ID: 378871

File Name: redhat-RHSA-2026-98582.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 11/11/2026

Updated: 11/11/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 92.91

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-77214

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.4

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

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

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 7.7

Threat Vector: CVSS:4.0/E:P

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

CVSS Score Source: CVE-2026-93990

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:10.3, p-cpe:/a:redhat:enterprise_linux:expat-devel, p-cpe:/a:redhat:enterprise_linux:expat

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/11/2026

Vulnerability Publication Date: 8/18/2026

Reference Information

CVE: CVE-2026-102633, CVE-2026-66046, CVE-2026-77214, CVE-2026-93990

CWE: 125, 176, 190, 407

RHSA: 2026:98582