CVE-2025-26465

Low

No strong exploitation signal.

CVSS base

6.8 MEDIUM

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

EPSS — probability of exploitation (30 days)

7.7%

94.3th percentile

CISA KEV

Not listed

Weakness / dates

CWE-390

Published 2025-02-18 · modified 2026-09-02

CVSS breakdown

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

Attack Vector	N	Network
Attack Complexity	H	High
Privileges Required	N	None
User Interaction	R	Required
Scope	U	Unchanged
Confidentiality	H	High
Integrity	H	High
Availability	N	None

Timeline

2025-02-18 — Published (NVD)
2026-09-02 — Last modified (NVD)

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.

Affected

debian netapp openbsd redhat

References

Official: NVD · CVE.org