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Debian dsa-6365 : libssh2-1-dev - security update

critical Nessus Plugin ID 323060

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6365 advisory.

 - ------------------------------------------------------------------------- Debian Security Advisory DSA-6365-1 [email protected] https://www.debian.org/security/ Moritz Muehlenhoff June 25, 2026 https://www.debian.org/security/faq
 - -------------------------------------------------------------------------

 Package : libssh2 CVE ID : CVE-2025-15661 CVE-2026-7598 CVE-2026-55199 CVE-2026-55200

 Multiple security vulnerabilities were discovered in libssh2, a client-side C library implementing the SSH2 protocol which could result in memory disclosure, denial of service or potentially the execution of arbitrary code.

 For the stable distribution (trixie), these problems have been fixed in version 1.11.1-1+deb13u1.

 We recommend that you upgrade your libssh2 packages.

 For the detailed security status of libssh2 please refer to its security tracker page at:
 https://security-tracker.debian.org/tracker/libssh2

 Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

 Mailing list: [email protected]

Tenable has extracted the preceding description block directly from the Debian 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

Upgrade the libssh2-1-dev packages.

See Also

https://packages.debian.org/source/trixie/libssh2

https://security-tracker.debian.org/tracker/CVE-2025-15661

https://security-tracker.debian.org/tracker/CVE-2026-55199

https://security-tracker.debian.org/tracker/CVE-2026-55200

https://security-tracker.debian.org/tracker/CVE-2026-7598

https://security-tracker.debian.org/tracker/source-package/libssh2

Plugin Details

Severity: Critical

ID: 323060

File Name: debian_DSA-6365.nasl

Version: 1.4

Type: Local

Agent: unix

Published: 6/26/2026

Updated: 7/16/2026

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

Risk Information

VPR

Risk Factor: High

Score: 8.5

Percentile: 99.69

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: 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 Score Source: CVE-2026-55200

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

CVSS Score Source: CVE-2026-55200

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libssh2-1-dev, p-cpe:/a:debian:debian_linux:libssh2-1t64, cpe:/o:debian:debian_linux:13.0

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/25/2026

Vulnerability Publication Date: 5/1/2026

Reference Information

CVE: CVE-2025-15661, CVE-2026-55199, CVE-2026-55200, CVE-2026-7598