SUSE SLES16 Security Update : libssh (SUSE-SU-2026:22956-1)

medium Nessus Plugin ID 330564

Synopsis

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

Description

The remote SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22956-1 advisory.

- CVE-2026-15370: stack buffer overflow in SFTP server longname construction (bsc#1272162).
- CVE-2026-59843: denial of service via zero advertised channel packet size (bsc#1272164).
- CVE-2026-59844: denial of service via oversized SFTP read length (bsc#1272165).
- CVE-2026-59845: denial of service via unchecked ProxyCommand fork() failure (bsc#1272166).
- CVE-2026-59846: information disclosure via ProxyCommand %r username expansion (bsc#1272167).
- CVE-2026-59847: integrity downgrade via OpenSSL AES-GCM tag verification (bsc#1272168).
- CVE-2026-59848: denial of service via SFTP responses with unknown request IDs (bsc#1272169).
- CVE-2026-59849: denial of service via automatic certificate authentication loop (bsc#1272170).
- CVE-2026-59850: use-after-free via data callbacks on closed channels (bsc#1272171).

Changes for libssh:

- Update to 0.11.5:

* Zero-initialize every ssh_string
* Fix compatibility with C23 / gcc16
* Fix multiple memory leaks, null checks, and error checks
* Validate peer public key in DH key exchange
* Avoid remote window overflow
* Avoid off-by-one overflow during kbdint authentication
* Avoid logging uninitialized sequence numbers
* Avoid double conversion of SFTP version number
* Send correct SFTP server version number
* Avoid handling repeated SFTP INIT messages
* Harmonize return values from SFTP server callbacks

- Update %suse_version checks for SLES 16.x (jsc#PED-15815)

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 libssh-config, libssh-devel and / or libssh4 packages.

Plugin Details

Severity: Medium

ID: 330564

File Name: suse_SU-2026-22956-1.nasl

Version: 1.1

Type: Local

Agent: unix

Family: SuSE Local Security Checks

Published: 7/29/2026

Updated: 7/29/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.13

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

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

CVSS Score Source: CVE-2026-59847

CVSS v3

Risk Factor: Medium

Base Score: 6.7

Temporal Score: 5.8

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

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

CVSS Score Source: CVE-2026-15370

Vulnerability Information

CPE: cpe:/o:novell:suse_linux:16, p-cpe:/a:novell:suse_linux:libssh-config, p-cpe:/a:novell:suse_linux:libssh-devel, p-cpe:/a:novell:suse_linux:libssh4

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/25/2026

Vulnerability Publication Date: 7/21/2026

Reference Information

CVE: CVE-2026-15370, CVE-2026-59843, CVE-2026-59844, CVE-2026-59845, CVE-2026-59846, CVE-2026-59847, CVE-2026-59848, CVE-2026-59849, CVE-2026-59850

SuSE: SUSE-SU-2026:22956-1

Detections

Analytics

SUSE SLES16 Security Update : libssh (SUSE-SU-2026:22956-1)

medium Nessus Plugin ID 330564

Synopsis

Description

Solution

See Also

Plugin Details

Risk Information

VPR

CVSS v2

CVSS v3

Vulnerability Information

Reference Information