SUSE-SU-2026:22940-1: moderate: Security update for libssh
SLE-UPDATES
null at suse.de
Tue Jul 28 12:30:58 UTC 2026
# Security update for libssh
Announcement ID: SUSE-SU-2026:22940-1
Release Date: 2026-07-25T17:13:20Z
Rating: moderate
References:
* bsc#1272162
* bsc#1272164
* bsc#1272165
* bsc#1272166
* bsc#1272167
* bsc#1272168
* bsc#1272169
* bsc#1272170
* bsc#1272171
* jsc#PED-15815
Cross-References:
* 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
CVSS scores:
* CVE-2026-15370 ( SUSE ): 5.4
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
* CVE-2026-15370 ( SUSE ): 6.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
* CVE-2026-15370 ( NVD ): 6.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
* CVE-2026-59843 ( SUSE ): 7.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
* CVE-2026-59843 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-59843 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-59844 ( SUSE ): 7.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
* CVE-2026-59844 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-59844 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-59845 ( SUSE ): 8.2
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
* CVE-2026-59845 ( SUSE ): 6.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
* CVE-2026-59845 ( NVD ): 5.3 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:N/A:H
* CVE-2026-59846 ( SUSE ): 2.4
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
* CVE-2026-59846 ( SUSE ): 3.9 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
* CVE-2026-59846 ( NVD ): 3.9 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
* CVE-2026-59847 ( SUSE ): 8.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
* CVE-2026-59847 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
* CVE-2026-59847 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
* CVE-2026-59848 ( SUSE ): 6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
* CVE-2026-59848 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-59848 ( NVD ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-59849 ( SUSE ): 2.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
* CVE-2026-59849 ( SUSE ): 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-59849 ( NVD ): 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-59850 ( SUSE ): 5.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
* CVE-2026-59850 ( SUSE ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-59850 ( NVD ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Affected Products:
* SUSE Linux Micro 6.2
An update that solves nine vulnerabilities and contains one feature can now be
installed.
## Description:
This update for libssh fixes the following issues:
* 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)
## 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 Micro 6.2
zypper in -t patch SUSE-SL-Micro-6.2-1349=1
## Package List:
* SUSE Linux Micro 6.2 (aarch64 ppc64le s390x x86_64)
* libssh4-debuginfo-0.11.5-160000.1.1
* libssh4-0.11.5-160000.1.1
* libssh-debugsource-0.11.5-160000.1.1
* SUSE Linux Micro 6.2 (noarch)
* libssh-config-0.11.5-160000.1.1
## References:
* https://www.suse.com/security/cve/CVE-2026-15370.html
* https://www.suse.com/security/cve/CVE-2026-59843.html
* https://www.suse.com/security/cve/CVE-2026-59844.html
* https://www.suse.com/security/cve/CVE-2026-59845.html
* https://www.suse.com/security/cve/CVE-2026-59846.html
* https://www.suse.com/security/cve/CVE-2026-59847.html
* https://www.suse.com/security/cve/CVE-2026-59848.html
* https://www.suse.com/security/cve/CVE-2026-59849.html
* https://www.suse.com/security/cve/CVE-2026-59850.html
* https://bugzilla.suse.com/show_bug.cgi?id=1272162
* https://bugzilla.suse.com/show_bug.cgi?id=1272164
* https://bugzilla.suse.com/show_bug.cgi?id=1272165
* https://bugzilla.suse.com/show_bug.cgi?id=1272166
* https://bugzilla.suse.com/show_bug.cgi?id=1272167
* https://bugzilla.suse.com/show_bug.cgi?id=1272168
* https://bugzilla.suse.com/show_bug.cgi?id=1272169
* https://bugzilla.suse.com/show_bug.cgi?id=1272170
* https://bugzilla.suse.com/show_bug.cgi?id=1272171
* https://jira.suse.com/browse/PED-15815
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