Description
A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.
References (7)
Core 7
Core References
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:24349
https://access.redhat.com/errata/RHSA-2026:24349
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:25911
https://access.redhat.com/errata/RHSA-2026:25911
Vendor Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:21977
Vendor Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:23024
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:20610
https://access.redhat.com/errata/RHSA-2026:20610
Third Party Advisory vdb-entry
x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2025-5372
Issue Tracking, Third Party Advisory issue-tracking
x_refsource_redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2369388
Scores
CVSS v3
5.0
EPSS
0.0041
EPSS Percentile
32.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-682
Status
published
Products (20)
libssh/libssh
< 0.11.2 (2 CPE variants)
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 6
Red Hat/Red Hat Enterprise Linux 7
Red Hat/Red Hat Enterprise Linux 8
0:0.9.6-16.el8_10
Red Hat/Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
0:0.9.4-2.el8_4.2
Red Hat/Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
0:0.9.4-2.el8_4.2
Red Hat/Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
0:0.9.6-4.el8_6.2
Red Hat/Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
0:0.9.6-4.el8_6.2
Red Hat/Red Hat Enterprise Linux 8.8 Telecommunications Update Service
0:0.9.6-13.el8_8.2
... and 10 more
Published
Jul 04, 2025
Tracked Since
Feb 18, 2026