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EulerOS 2.0 SP13 : libssh (EulerOS-SA-2026-4064)

high Nessus Plugin ID 364825

Synopsis

The remote EulerOS host is missing multiple security updates.

Description

According to the versions of the libssh packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

 A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service.(CVE-2026-59843)

 A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.(CVE-2026-59845)

 A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with an arbitrarily large length, causing a libssh SFTP server to allocate excessive memory and potentially exhaust it through repeated requests.(CVE-2026-59844)

 A flaw was found in libssh. If data packets are processed after a channel is closed, channel data callbacks can be invoked after the associated data has already been freed, leading to crashes or possible use-after-free conditions.(CVE-2026-59850)

 A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can effectively remove integrity protection, allowing an in-path attacker to modify plaintext on the wire without detection.(CVE-2026-59847)

Tenable has extracted the preceding description block directly from the EulerOS libssh 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 packages.

See Also

http://www.nessus.org/u?14ab5ac5

Plugin Details

Severity: High

ID: 364825

File Name: EulerOS_SA-2026-4064.nasl

Version: 1.1

Type: Local

Published: 10/12/2026

Updated: 10/12/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.19

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-59847

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/o:huawei:euleros:2.0, p-cpe:/a:huawei:euleros:libssh-devel, p-cpe:/a:huawei:euleros:libssh-help, p-cpe:/a:huawei:euleros:libssh

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

Excluded KB Items: Host/EulerOS/uvp_version

Exploit Ease: No known exploits are available

Patch Publication Date: 10/10/2026

Vulnerability Publication Date: 7/21/2026

Reference Information

CVE: CVE-2026-59843, CVE-2026-59844, CVE-2026-59845, CVE-2026-59847, CVE-2026-59850

IAVA: 2026-A-0788