Detections
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Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS / 26.10 : libsoup vulnerabilities (USN-8975-1)

critical Nessus Plugin ID 375783

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS / 26.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8975-1 advisory.

 It was discovered that libsoup incorrectly handled certain WebSocket frames. A remote attacker could possibly use this issue to cause an application to crash or expose sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-12478)

 It was discovered that libsoup incorrectly handled certain data URIs. A remote attacker could possibly use this issue to cause an application to crash or expose sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-102555)

 It was discovered that libsoup incorrectly handled certain WebSocket messages. A remote attacker could possibly use this issue to cause an application to crash. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10.
 (CVE-2026-102556)

 It was discovered that libsoup incorrectly handled fragmented WebSocket messages. A remote attacker could possibly use this issue to cause an application to crash. (CVE-2026-102557)

 It was discovered that libsoup incorrectly handled certain WebSocket frames. A remote attacker could possibly use this issue to cause an application to crash. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10.
 (CVE-2026-102558)

 It was discovered that libsoup incorrectly handled large WebSocket messages. An attacker could possibly use this issue to cause an application to crash. (CVE-2026-102559)

 It was discovered that libsoup incorrectly handled compressed WebSocket messages. An attacker could possibly use this issue to cause an application to crash. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-102560)

 It was discovered that libsoup did not properly handle certain HTTP requests. A remote attacker could possibly use this issue to inject arbitrary HTTP requests. (CVE-2026-103399)

 It was discovered that libsoup incorrectly handled proxy credentials. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-12547)

 It was discovered that libsoup incorrectly handled multipart messages. A remote attacker could possibly use this issue to cause an application to crash or obtain sensitive information. (CVE-2026-12548)

Tenable has extracted the preceding description block directly from the Ubuntu 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 affected packages.

See Also

https://ubuntu.com/security/notices/USN-8975-1

Plugin Details

Severity: Critical

ID: 375783

File Name: ubuntu_USN-8975-1.nasl

Version: 1.2

Type: Local

Agent: unix

Published: 11/4/2026

Updated: 11/4/2026

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: Medium

Score: 5.9

Percentile: 96.19

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

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: 8.8

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:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.10, p-cpe:/a:canonical:ubuntu_linux:gir1.2-soup-2.4, p-cpe:/a:canonical:ubuntu_linux:gir1.2-soup-3.0, p-cpe:/a:canonical:ubuntu_linux:libsoup-2.4-1, p-cpe:/a:canonical:ubuntu_linux:libsoup-3.0-0, p-cpe:/a:canonical:ubuntu_linux:libsoup-3.0-common, p-cpe:/a:canonical:ubuntu_linux:libsoup-3.0-tests, p-cpe:/a:canonical:ubuntu_linux:libsoup-gnome-2.4-1, p-cpe:/a:canonical:ubuntu_linux:libsoup-gnome2.4-1, p-cpe:/a:canonical:ubuntu_linux:libsoup2.4-1, p-cpe:/a:canonical:ubuntu_linux:libsoup2.4-common, p-cpe:/a:canonical:ubuntu_linux:libsoup2.4-tests

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/3/2026

Vulnerability Publication Date: 6/11/2026

Reference Information

CVE: CVE-2026-102555, CVE-2026-102556, CVE-2026-102557, CVE-2026-102558, CVE-2026-102559, CVE-2026-102560, CVE-2026-103399, CVE-2026-12478, CVE-2026-12547, CVE-2026-12548

USN: 8975-1