RHEL 9 : libsoup (RHSA-2026:98453)

critical Nessus Plugin ID 378806

Synopsis

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

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:98453 advisory.

The libsoup packages provide an HTTP client and server library for GNOME.

Security Fix(es):

* SoupWebsocketExtensionDeflate: libsoup: libsoup: WebSocket permessage-deflate Unbounded Decompression Remote Denial of Service (CVE-2026-15709)

* libsoup: SoupWebsocketConnection: libsoup: WebSocket remote denial of service via oversized control frame protocol violation (CVE-2026-15711)

* libsoup: libsoup: Heap buffer overflow from WebSocket Pong signal type confusion (CVE-2026-102556)

* libsoup: libsoup: Heap buffer overflow during WebSocket message reassembly (CVE-2026-102557)

* libsoup: libsoup: Heap buffer overflow during WebSocket receive-buffer growth (CVE-2026-102558)

* libsoup: libsoup: Heap buffer overflow during WebSocket client-frame masking (CVE-2026-102559)

* libsoup: libsoup: Heap buffer overflow during outgoing permessage-deflate buffer growth (CVE-2026-102560)

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 libsoup package based on the guidance in RHSA-2026:98453.

Plugin Details

Severity: Critical

ID: 378806

File Name: redhat-RHSA-2026-98453.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 11/11/2026

Updated: 11/11/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

Percentile: 96.19

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-102560

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:libsoup-devel, p-cpe:/a:redhat:enterprise_linux:libsoup

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: 11/11/2026

Vulnerability Publication Date: 7/14/2026

Reference Information

CVE: CVE-2026-102556, CVE-2026-102557, CVE-2026-102558, CVE-2026-102559, CVE-2026-102560, CVE-2026-15709, CVE-2026-15711

CWE: 125, 409, 770, 843

RHSA: 2026:98453

Detections

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