CVE intelligence and bounded remediation

CVE-2025-26465 — A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled

Medium CVSS 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.

Severity
Medium
CVSS
6.8 (3.1)
Published
2025-02-18
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-390

Affected products

  • openbsd / openssh
  • openbsd / openssh / 6.8
  • openbsd / openssh / 9.9
  • netapp / active_iq_unified_manager
  • netapp / ontap / 9
  • redhat / openshift_container_platform / 4.0

Showing 6 representative product identities from 10 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

General vulnerability remediation

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Confirm the affected component, deployment paths, reachable interfaces, and enabled features from inventories and configuration, without probing production destructively.
  • Compare the advisory's affected conditions with the repository lockfiles, build manifests, artifacts, and runtime inventory.
  • Identify data sensitivity, trust boundaries, and privilege level for every confirmed affected deployment.

Remediate safely

  • Apply a vendor-supported fix or remove the affected component or feature; record the selected change and its source in the repository.
  • Update direct and transitive dependency locks, generated artifacts, deployment manifests, and asset inventories together.
  • Add a regression test for the documented unsafe condition using inert inputs and preserve rollback instructions.

Authoritative sources

Complete CVE record and remediation plan

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