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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-26465 Detail

Description

A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://access.redhat.com/errata/RHSA-2025:16823 Red Hat, Inc.
https://access.redhat.com/errata/RHSA-2025:3837 Red Hat, Inc.
https://access.redhat.com/errata/RHSA-2025:6993 Red Hat, Inc.
https://access.redhat.com/errata/RHSA-2025:8385 Red Hat, Inc.
https://access.redhat.com/security/cve/CVE-2025-26465 Red Hat, Inc. Third Party Advisory 
https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466 CVE Third Party Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=2344780 Red Hat, Inc. Issue Tracking  Third Party Advisory 
https://bugzilla.suse.com/show_bug.cgi?id=1237040 CVE Issue Tracking 
https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sig CVE Patch 
https://lists.debian.org/debian-lts-announce/2025/02/msg00020.html CVE Third Party Advisory 
https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.html CVE Third Party Advisory 
https://seclists.org/oss-sec/2025/q1/144 CISA-ADP, Inc., Red Hat Mailing List  Third Party Advisory 
https://security-tracker.debian.org/tracker/CVE-2025-26465 CVE Third Party Advisory 
https://security.netapp.com/advisory/ntap-20250228-0003/ CVE Third Party Advisory 
https://ubuntu.com/security/CVE-2025-26465 CVE Third Party Advisory 
https://www.openssh.com/releasenotes.html#9.9p2 CVE Release Notes 
https://www.openwall.com/lists/oss-security/2025/02/18/1 CVE Mailing List  Third Party Advisory 
https://www.openwall.com/lists/oss-security/2025/02/18/4 CVE Mailing List  Third Party Advisory 
https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/ CVE Press/Media Coverage 
https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-openssh CVE Third Party Advisory 
https://www.vicarius.io/vsociety/posts/cve-2025-26465-mitigate-vulnerable-openssh CVE Mitigation  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-390 Detection of Error Condition Without Action Red Hat, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

12 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-26465
NVD Published Date:
02/18/2025
NVD Last Modified:
09/26/2025
Source:
Red Hat, Inc.