CVE-2025-26465 - CVE House
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Status published Medium CVE-2025-26465

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

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

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Affected Vendor

Affected Software

Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.4 Extended Update Support, Red Hat Discovery 1.14, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4
Vulnerable Versions:
6.8p1, 0:8.0p1-26.el8_10, 0:8.7p1-45.el9, 0:8.7p1-38.el9_4.5, sha256:f33991d766b618a128fb99fbe4f9b61c5004f7c6aa73b2b38e28d59e56c64d63

Timeline

Official Publish: February 18th, 2025
Last Modified: July 14th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Weaknesses (CWE)

CWE-390

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.