Vulnerability · NVD
CVE-2025-26465
MEDIUM 6.8
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.
Attack vector : Network
No privileges required
Show raw CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
EPSS
7.45%
above median
percentile 93.9%
OS versions that fix this CVE
This CVE is resolved by the following OS security releases. Update the OS to at least the listed version.