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openSUSE 16 Security Update : libssh2_org (openSUSE-SU-2026:21057-1)

critical Nessus Plugin ID 324070

Synopsis

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

Description

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21057-1 advisory.

 This update for libssh2_org fixes the following issues

 - CVE-2026-55199: pre-Authentication DoS via SSH_MSG_EXT_INFO Handler (bsc#1268530).
 - CVE-2026-55200: out-of-Bounds write via Unchecked packet_length in transport.c (bsc#1268531).

Tenable has extracted the preceding description block directly from the SUSE 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 libssh2-1 and / or libssh2-devel packages.

See Also

https://bugzilla.suse.com/1268530

https://bugzilla.suse.com/1268531

https://www.suse.com/security/cve/CVE-2026-55199

https://www.suse.com/security/cve/CVE-2026-55200

Plugin Details

Severity: Critical

ID: 324070

File Name: openSUSE-2026-21057-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/1/2026

Updated: 7/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.5

Percentile: 99.7

CVSS v2

Risk Factor: High

Base Score: 9.7

Temporal Score: 7.6

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

CVSS Score Source: CVE-2026-55200

CVSS v3

Risk Factor: High

Base Score: 8.3

Temporal Score: 7.5

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 8.2

Threat Vector: CVSS:4.0/E:P

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

Vulnerability Information

CPE: p-cpe:/a:novell:opensuse:libssh2-1, p-cpe:/a:novell:opensuse:libssh2-devel, cpe:/o:novell:opensuse:16.0

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/25/2026

Vulnerability Publication Date: 6/17/2026

Reference Information

CVE: CVE-2026-55199, CVE-2026-55200