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Vulnerabilities

Vulnerability · CVE-2025-26465

A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled.

Published Feb 18, 2025 · catalog updated Oct 21, 2026 · A vulnerability was found

Check if you run it

No confirmed exploitation is on record for CVE-2025-26465. EPSS is 7.72%. Act only if a listed version of A vulnerability was found is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A vulnerability was found).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
7.72%
Remediation
Version ranges on file
Affected products
cpe debian/debian linux · cpe openbsd/openssh · cpe redhat/enterprise linux · cpe redhat/openshift container platform

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe debian/debian linux11.0
  • cpe debian/debian linux12.0
  • cpe openbsd/openssh6.8
  • cpe openbsd/openssh9.9
  • cpe openbsd/openssh>= 6.9, <= 9.8
  • cpe redhat/enterprise linux9.0
  • cpe redhat/openshift container platform4.0

How to fix CVE-2025-26465

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-26465. EPSS is 7.72%. Act only if a listed version of A vulnerability was found is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 11.0; debian/debian linux 12.0; redhat/enterprise linux 9.0; redhat/openshift container platform 4.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-390. EPSS 7.72%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 18, 2025 · NIST NVD

    Detected

    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 re

  2. Oct 21, 2026 · NIST NVD

    Updated

    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 re

  3. Oct 21, 2026 · NIST NVD

    Updated

    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 re

Sources

  • CVE.orgVulnerability recordCVE-2025-26465

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-26465

    30-day exploitation probability 7.72%

    first.org
  • NIST NVDVulnerability recordCVE-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 malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 21, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.