SUSE-SU-2026:3541-1: important: Security update for libssh2_org

OPENSUSE-SECURITY-UPDATES <[email protected]>
Newsgroups gmane.linux.suse.security.announce
Message-ID <178639418719.541.7332503805925083990@2ccfedc5fe8d> 
# Security update for libssh2_org

Announcement ID: SUSE-SU-2026:3541-1  
Release Date: 2026-08-10T12:50:14Z  
Rating: important  
References:

  * bsc#1263890
  * bsc#1268546
  * bsc#1269567
  * bsc#1269568
  * bsc#1272734
  * bsc#1272735
  * bsc#1272736
  * bsc#1272737

  
Cross-References:

  * CVE-2025-15661
  * CVE-2026-58050
  * CVE-2026-58051
  * CVE-2026-66032
  * CVE-2026-66033
  * CVE-2026-66034
  * CVE-2026-66035
  * CVE-2026-7598

  
CVSS scores:

  * CVE-2025-15661 ( SUSE ):  6.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:H
  * CVE-2025-15661 ( NVD ):  8.3
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2025-15661 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
  * CVE-2025-15661 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
  * CVE-2026-58050 ( SUSE ):  9.2
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-58050 ( SUSE ):  8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-58050 ( NVD ):  8.3
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-58050 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-58050 ( NVD ):  7.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
  * CVE-2026-58051 ( SUSE ):  8.3
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-58051 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
  * CVE-2026-58051 ( NVD ):  8.3
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-58051 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
  * CVE-2026-66032 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-66032 ( SUSE ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-66032 ( NVD ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-66032 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-66033 ( SUSE ):  8.7
    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
  * CVE-2026-66033 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-66033 ( NVD ):  8.7
    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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-66033 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-66034 ( SUSE ):  7.7
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-66034 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-66034 ( NVD ):  7.7
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-66034 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-66035 ( SUSE ):  7.7
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-66035 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-66035 ( NVD ):  7.7
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-66035 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-7598 ( SUSE ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-7598 ( SUSE ):  7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2026-7598 ( NVD ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-7598 ( NVD ):  7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2026-7598 ( NVD ):  9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

  
Affected Products:

  * Basesystem Module 15-SP7
  * openSUSE Leap 15.6
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Real Time 15 SP7
  * SUSE Linux Enterprise Server 15 SP6
  * SUSE Linux Enterprise Server 15 SP6 LTSS
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7

  
  
An update that solves eight vulnerabilities can now be installed.

## Description:

This update for libssh2_org fixes the following issues:

  * 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-2026-58050: 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).

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise Server 15 SP6 LTSS  
    zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-3541=1

  * SUSE Linux Enterprise Server for SAP Applications 15 SP6  
    zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-3541=1

  * Basesystem Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-3541=1

  * openSUSE Leap 15.6  
    zypper in -t patch SUSE-2026-3541=1

## Package List:

  * Basesystem Module 15-SP7 (aarch64 ppc64le s390x x86_64)
    * libssh2-1-debuginfo-1.11.0-150600.20.6.1
    * libssh2-devel-1.11.0-150600.20.6.1
    * libssh2_org-debugsource-1.11.0-150600.20.6.1
    * libssh2-1-1.11.0-150600.20.6.1
  * Basesystem Module 15-SP7 (x86_64)
    * libssh2-1-32bit-debuginfo-1.11.0-150600.20.6.1
    * libssh2-1-32bit-1.11.0-150600.20.6.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6 (ppc64le x86_64)
    * libssh2-1-debuginfo-1.11.0-150600.20.6.1
    * libssh2-devel-1.11.0-150600.20.6.1
    * libssh2-1-1.11.0-150600.20.6.1
    * libssh2_org-debugsource-1.11.0-150600.20.6.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6 (x86_64)
    * libssh2-1-32bit-debuginfo-1.11.0-150600.20.6.1
    * libssh2-1-32bit-1.11.0-150600.20.6.1
  * SUSE Linux Enterprise Server 15 SP6 LTSS (aarch64 ppc64le s390x x86_64)
    * libssh2-1-debuginfo-1.11.0-150600.20.6.1
    * libssh2-devel-1.11.0-150600.20.6.1
    * libssh2_org-debugsource-1.11.0-150600.20.6.1
    * libssh2-1-1.11.0-150600.20.6.1
  * SUSE Linux Enterprise Server 15 SP6 LTSS (x86_64)
    * libssh2-1-32bit-debuginfo-1.11.0-150600.20.6.1
    * libssh2-1-32bit-1.11.0-150600.20.6.1
  * openSUSE Leap 15.6 (x86_64)
    * libssh2-1-32bit-debuginfo-1.11.0-150600.20.6.1
    * libssh2-1-32bit-1.11.0-150600.20.6.1
  * openSUSE Leap 15.6 (aarch64 i586 ppc64le s390x x86_64)
    * libssh2-1-debuginfo-1.11.0-150600.20.6.1
    * libssh2-devel-1.11.0-150600.20.6.1
    * libssh2_org-debugsource-1.11.0-150600.20.6.1
    * libssh2-1-1.11.0-150600.20.6.1
  * openSUSE Leap 15.6 (aarch64_ilp32)
    * libssh2-1-64bit-1.11.0-150600.20.6.1
    * libssh2-1-64bit-debuginfo-1.11.0-150600.20.6.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-15661.html
  * https://www.suse.com/security/cve/CVE-2026-58050.html
  * https://www.suse.com/security/cve/CVE-2026-58051.html
  * https://www.suse.com/security/cve/CVE-2026-66032.html
  * https://www.suse.com/security/cve/CVE-2026-66033.html
  * https://www.suse.com/security/cve/CVE-2026-66034.html
  * https://www.suse.com/security/cve/CVE-2026-66035.html
  * https://www.suse.com/security/cve/CVE-2026-7598.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1263890
  * https://bugzilla.suse.com/show_bug.cgi?id=1268546
  * https://bugzilla.suse.com/show_bug.cgi?id=1269567
  * https://bugzilla.suse.com/show_bug.cgi?id=1269568
  * https://bugzilla.suse.com/show_bug.cgi?id=1272734
  * https://bugzilla.suse.com/show_bug.cgi?id=1272735
  * https://bugzilla.suse.com/show_bug.cgi?id=1272736
  * https://bugzilla.suse.com/show_bug.cgi?id=1272737
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