CVE-2025-26465mediumCWE-390

CVE-2025-26465: medium-severity vulnerability in OpenSSH

Openssh: machine-in-the-middle attack if verifyhostkeydns is enabled

Published · Updated

Follow this CVE+ Monitor Red Hat Enterprise Linux+ Monitor Red Hat OpenShift Container Platform

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.8epss 7.7%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Affected products
OpenSSHRed Hat · Red Hat Discovery 1.14Red Hat · Red Hat Enterprise Linux 10Red Hat · Red Hat Enterprise Linux 6Red Hat · Red Hat Enterprise Linux 7Red Hat · Red Hat Enterprise Linux 8Red Hat · Red Hat Enterprise Linux 9Red Hat · Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat · Red Hat OpenShift Container Platform 4
Related CVEs — OpenSSH

In the same product, most dangerous first.

CVE-2024-6387HIGHOpenssh: regresshion - race condition in ssh allows rce/dosEPSS 99.5%CVE-2024-3094CRITICALXz: malicious code in distributed sourceEPSS 90.9%CVE-2024-12084CRITICALRsync: heap buffer overflow in rsync due to improper checksum length handlingEPSS 72.5%CVE-2025-10230CRITICALSamba: command injection in wins server hook scriptEPSS 39.8%CVE-2025-26466MEDIUMOpenssh: denial-of-service in opensshEPSS 38.7%CVE-2026-4480CRITICALSamba: samba: remote code execution in printing subsystem via unescaped job descriptionEPSS 28.7%