Buffer underflow in libssh - CVE-2026-0966

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Main Vulnerability Database Vulnerabilities #VU123154

Buffer underflow in libssh - CVE-2026-0966

Published: February 24, 2026


Vulnerability identifier: #VU123154
CSH Severity: Low
CVSS v4: 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-ID: CVE-2026-0966
CWE-ID: CWE-124
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to a boundary error within the ssh_get_hexa() function when reading zero-length input during GSSAPI authentication. A remote attacker can send specially crafted data to the application and perform a denial of service attack. 


Affected software

libssh
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
SUSE Linux Micro
Basesystem Module
openSUSE Leap
Ubuntu
openEuler
Anolis OS
LANTIME Operating System Firmware (LTOS)
libssh (Ubuntu package)
libssh
libssh-debuginfo
libssh-debugsource
libssh-devel
libssh-help
libssh-config
libssh4-32bit
libssh4-debuginfo-32bit
libssh4-debuginfo
libssh4
libssh4-64bit
libssh4-32bit-debuginfo
libssh4-64bit-debuginfo
libssh-doc

How to mitigate CVE-2026-0966

Install updates from vendor's website.

libssh - update to 0.11.4
LANTIME Operating System Firmware (LTOS) - update to 7.10.009
libssh (Ubuntu package) - addressed in versions 0.6.3-4.3ubuntu0.6+esm4, 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6, 0.9.3-2ubuntu2.5+esm3
libssh - addressed in versions 0.9.4-15, 0.9.6-15, 0.10.5-9
libssh-debuginfo - addressed in versions 0.9.4-15, 0.9.6-15, 0.10.5-9
libssh-debugsource - addressed in versions 0.9.4-15, 0.9.6-15, 0.10.5-9
libssh-devel - addressed in versions 0.9.4-15, 0.9.6-15, 0.10.5-9
libssh-help - addressed in versions 0.9.4-15, 0.9.6-15, 0.10.5-9
libssh-config - addressed in versions 0.9.8-3.21.1, 0.9.8-150200.13.15.1, 0.9.8-150600.11.9.1, 0.11.4-160000.1.1
libssh4-32bit - addressed in versions 0.9.8-3.21.1, 0.9.8-150600.11.9.1
libssh4-debuginfo-32bit - update to 0.9.8-3.21.1
libssh4-debuginfo - addressed in versions 0.9.8-3.21.1, 0.9.8-150200.13.15.1, 0.9.8-150600.11.9.1, 0.11.4-160000.1.1
libssh4 - addressed in versions 0.9.8-3.21.1, 0.9.8-150200.13.15.1, 0.9.8-150600.11.9.1, 0.11.4-160000.1.1
libssh-debugsource - addressed in versions 0.9.8-3.21.1, 0.9.8-150200.13.15.1, 0.9.8-150600.11.9.1, 0.11.4-160000.1.1
libssh-devel - addressed in versions 0.9.8-3.21.1, 0.9.8-150600.11.9.1
libssh4-64bit - update to 0.9.8-150600.11.9.1
libssh4-32bit-debuginfo - update to 0.9.8-150600.11.9.1
libssh4-64bit-debuginfo - update to 0.9.8-150600.11.9.1
libssh-doc - update to 0.10.5-13
libssh-config - update to 0.10.5-13
libssh-devel - update to 0.10.5-13
libssh - update to 0.10.5-13

External References

Related Security Bulletins