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SUSE SLES12 Security Update : libssh2_org (SUSE-SU-2026:3525-1)

high Nessus Plugin ID 333542

Synopsis

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

Description

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3525-1 advisory.

 - CVE-2025-15661: out-of-bounds heap read vulnerability in the `sftp_symlink()` function in `src/sftp.c` (bsc#1268546).
 - CVE-2026-7598: integer overflow in function `userauth_password` of file `src/userauth.c` (bsc#1263890).
 - CVE-2026-55199: pre-authentication DoS via the `SSH_MSG_EXT_INFO` handler (bsc#1268530).
 - CVE-2026-58050: heap buffer overflow due to missing bounds check in attribute count of publickey- subsystem response (bsc#1269568).
 - CVE-2026-58051: uninitialized pointer freed when malformed responses are sent by an SSH server (bsc#1269567).
 - CVE-2026-66032: arbitrary code execution via double-free in SFTP session (bsc#1272737).
 - CVE-2026-66033: denial of service via integer underflow in AES-GCM cipher negotiation (bsc#1272736).
 - CVE-2026-66034: information disclosure and potential arbitrary code execution via heap out-of-bounds read (bsc#1272735).
 - CVE-2026-66035: arbitrary code execution via heap buffer overflow during SSH negotiation (bsc#1272734).

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, libssh2-1-32bit and / or libssh2-devel packages.

See Also

https://bugzilla.suse.com/1263890

https://bugzilla.suse.com/1268530

https://bugzilla.suse.com/1268546

https://bugzilla.suse.com/1269567

https://bugzilla.suse.com/1269568

https://bugzilla.suse.com/1272734

https://bugzilla.suse.com/1272735

https://bugzilla.suse.com/1272736

https://bugzilla.suse.com/1272737

https://www.suse.com/security/cve/CVE-2025-15661

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

https://www.suse.com/security/cve/CVE-2026-58050

https://www.suse.com/security/cve/CVE-2026-58051

https://www.suse.com/security/cve/CVE-2026-66032

https://www.suse.com/security/cve/CVE-2026-66033

https://www.suse.com/security/cve/CVE-2026-66034

https://www.suse.com/security/cve/CVE-2026-66035

https://www.suse.com/security/cve/CVE-2026-7598

http://www.nessus.org/u?88f9c021

Plugin Details

Severity: High

ID: 333542

File Name: suse_SU-2026-3525-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/9/2026

Updated: 8/9/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.6

Percentile: 98.4

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2026-7598

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

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

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

CVSS Score Source: CVE-2025-15661

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:N/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-66033

Vulnerability Information

CPE: cpe:/o:novell:suse_linux:12, p-cpe:/a:novell:suse_linux:libssh2-1-32bit, p-cpe:/a:novell:suse_linux:libssh2-1, p-cpe:/a:novell:suse_linux:libssh2-devel

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: 8/7/2026

Vulnerability Publication Date: 5/1/2026

Reference Information

CVE: CVE-2025-15661, CVE-2026-55199, CVE-2026-58050, CVE-2026-58051, CVE-2026-66032, CVE-2026-66033, CVE-2026-66034, CVE-2026-66035, CVE-2026-7598

SuSE: SUSE-SU-2026:3525-1