CVE Watch21 oct 2026

CVE-2025-26465

A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malic

CVSS

6.8

Medio

EPSS

7.7%

p95

KEV

—

Exploit Today

0-100

Publicado: 18 feb 2025 · Última mod.: 21 oct 2026 · CWE-390

EPSS · 30d

7.7%EPSS · 30 días7.7%

2026-10-022026-10-30

Descripción técnica

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.

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