CVE-2025-5372 json
Libssh: incorrect return code handling in ssh_kdf() in libssh
published 2025-07-04 16 mo ago modified 2026-11-05 3 d ago also EUVD-2025-19931 , JLSEC-2025-97
- cvss
- 5.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 44%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- julia libssh_jll 0.11.3+0
- libssh libssh 0.11.2
- 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
- Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:0.9.6-13.el8_8.2
- Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:0.9.6-3.el9_0.2
- libssh Debian 12 0.10.6-0+deb12u2
- libssh Debian 14, Debian 13 0.11.2-1
debian advisories DEBIAN-CVE-2025-5372
- libssh Ubuntu 22.04 LTS 0.9.6-2ubuntu0.22.04.4
- libssh Ubuntu 24.04 LTS 0.10.6-2ubuntu0.1
ubuntu advisories UBUNTU-CVE-2025-5372
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- libssh RHEL 8 0.9.6-16.el8_10
- libssh-config RHEL 8 0.9.6-16.el8_10
- libssh RHEL 8.6 EUS_LONG_LIFE, RHEL 8.6 AUS 0.9.6-4.el8_6.2
- libssh-config RHEL 8.6 EUS_LONG_LIFE, RHEL 8.6 AUS 0.9.6-4.el8_6.2
- libssh RHEL 8.4 EUS_LONG_LIFE, RHEL 8.4 AUS 0.9.4-2.el8_4.2
- libssh-config RHEL 8.4 EUS_LONG_LIFE, RHEL 8.4 AUS 0.9.4-2.el8_4.2
- libssh RHEL 8.8 TUS, RHEL 8.8 E4S 0.9.6-13.el8_8.2
- libssh-config RHEL 8.8 TUS, RHEL 8.8 E4S 0.9.6-13.el8_8.2
red hat advisories RHSA-2026:25911RHSA-2026:24349RHSA-2026:20610RHSA-2025:23024RHSA-2025:21977
- libssh Linux Micro 6.1 0.10.6-slfo.1.1_2.1
- libssh Linux Micro 6.0 0.10.6-2.1
- libssh SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +3 more 0.9.8-150200.13.9.1
- libssh SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +10 more 0.9.8-150400.3.9.1
- libssh SLE Module for Basesystem 15 SP7, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 0.9.8-150600.11.3.1
- libssh SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.9.8-3.15.1
suse advisories SUSE-SU-2025:20596-1SUSE-SU-2025:20557-1SUSE-SU-2025:02281-1SUSE-SU-2025:02279-1SUSE-SU-2025:02278-1SUSE-SU-2025:02229-1
- libssh openSUSE Tumbleweed 0.11.2-1.1
opensuse advisories openSUSE-SU-2025:15243-1
- libssh AlmaLinux 8 0.9.6-16.el8_10
- libssh-config AlmaLinux 8 0.9.6-16.el8_10
almalinux advisories ALSA-2025:21977
- libssh Rocky Linux 8 0.9.6-16.el8_10
rocky linux advisories RLSA-2025:21977
- libssh Alpine 3.24, Alpine 3.23, Alpine 3.22 0.11.2-r0
alpine advisories ALPINE-CVE-2025-5372
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- libssh CBL-Mariner 2.0, Azure Linux 3.0 0.10.6-2
azure linux advisories AZL-64650AZL-64656
Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2025-5372 updated cvss 5.0
libssh: Incorrect Return Code Handling in ssh_kdf() in libssh
-
Red Hat Enterprise Linux 6 libssh2 Red Hat Enterprise Linux 7 libssh2affected: workaround, no fix planned “Out of support scope”
-
Red Hat Enterprise Linux 9 libssh, libssh-config Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8affected: workaround, no fix available
-
Red Hat Enterprise Linux AppStream (v. 8) libssh-devel 0.9.6-16.el8_10, libssh-debuginfo 0.9.6-16.el8_10, libssh-debugsource 0.9.6-16.el8_10fixed: vendor fix RHSA-2025:21977
-
Red Hat Enterprise Linux AppStream AUS (v.8.4) libssh-devel 0.9.4-2.el8_4.2, libssh-debuginfo 0.9.4-2.el8_4.2, libssh-debugsource 0.9.4-2.el8_4.2fixed: vendor fix RHSA-2026:24349
-
Red Hat Enterprise Linux AppStream AUS (v.8.6) libssh-devel 0.9.6-4.el8_6.2, libssh-debuginfo 0.9.6-4.el8_6.2, libssh-debugsource 0.9.6-4.el8_6.2fixed: vendor fix RHSA-2026:25911
-
Red Hat Enterprise Linux AppStream E4S (v.8.8) libssh-devel 0.9.6-13.el8_8.2, libssh-debuginfo 0.9.6-13.el8_8.2, libssh-debugsource 0.9.6-13.el8_8.2fixed: vendor fix RHSA-2026:20610
-
Red Hat Enterprise Linux AppStream E4S (v.9.0) libssh-devel 0.9.6-3.el9_0.2, libssh-debuginfo 0.9.6-3.el9_0.2, libssh-debugsource 0.9.6-3.el9_0.2fixed: vendor fix RHSA-2025:23024
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) libssh-devel 0.9.4-2.el8_4.2, libssh-debuginfo 0.9.4-2.el8_4.2, libssh-debugsource 0.9.4-2.el8_4.2fixed: vendor fix RHSA-2026:24349
show 11 moreshow fewer
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) libssh-devel 0.9.6-4.el8_6.2, libssh-debuginfo 0.9.6-4.el8_6.2, libssh-debugsource 0.9.6-4.el8_6.2fixed: vendor fix RHSA-2026:25911
-
Red Hat Enterprise Linux AppStream TUS (v.8.8) libssh-devel 0.9.6-13.el8_8.2, libssh-debuginfo 0.9.6-13.el8_8.2, libssh-debugsource 0.9.6-13.el8_8.2fixed: vendor fix RHSA-2026:20610
-
Red Hat Enterprise Linux BaseOS (v. 8) libssh 0.9.6-16.el8_10, libssh-config 0.9.6-16.el8_10fixed: vendor fix RHSA-2025:21977
-
Red Hat Enterprise Linux BaseOS AUS (v.8.4) libssh 0.9.4-2.el8_4.2, libssh-config 0.9.4-2.el8_4.2fixed: vendor fix RHSA-2026:24349
-
Red Hat Enterprise Linux BaseOS AUS (v.8.6) libssh 0.9.6-4.el8_6.2, libssh-config 0.9.6-4.el8_6.2fixed: vendor fix RHSA-2026:25911
-
Red Hat Enterprise Linux BaseOS E4S (v.8.8) libssh 0.9.6-13.el8_8.2, libssh-config 0.9.6-13.el8_8.2fixed: vendor fix RHSA-2026:20610
-
Red Hat Enterprise Linux BaseOS E4S (v.9.0) libssh 0.9.6-3.el9_0.2, libssh-config 0.9.6-3.el9_0.2fixed: vendor fix RHSA-2025:23024
-
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) libssh 0.9.4-2.el8_4.2, libssh-config 0.9.4-2.el8_4.2fixed: vendor fix RHSA-2026:24349
-
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) libssh 0.9.6-4.el8_6.2, libssh-config 0.9.6-4.el8_6.2fixed: vendor fix RHSA-2026:25911
-
Red Hat Enterprise Linux BaseOS TUS (v.8.8) libssh 0.9.6-13.el8_8.2, libssh-config 0.9.6-13.el8_8.2fixed: vendor fix RHSA-2026:20610
-
Red Hat Enterprise Linux 10 libssh Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9not affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 16 mo ago
Exploit prediction
0.51% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.0 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| julia | libssh_jll | <0.11.3+0 |
0.11.3+0 |
Affected products
- libssh libssh
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
- Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
- Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
- Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
- 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 9
- Red Hat Red Hat OpenShift Container Platform 4
Classification
- Weakness
-
- CWE-682 Incorrect Calculation
References
-
access.redhat.com
/errata/RHSA-2025:21977
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2025:23024
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:20610
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:24349
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:25911
vendor-advisory, web
-
access.redhat.com
/security/cve/CVE-2025-5372
vdb-entry, third-party-advisory, web
-
bugzilla.redhat.com
/show_bug.cgi?id=2369388
issue-tracking, third-party-advisory, web
Sources
- CVE List CVE-2025-5372
- NVD CVE-2025-5372
- OSV JLSEC-2025-97
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.