CVE-2025-26465
Scores
EPSS
Percentile: 73.6%
CVSS
CVSS Score: 6.8/10
All CVSS Scores
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
High (H)
Describes the conditions beyond the attacker's control
Privileges Required
None (N)
Describes the level of privileges an attacker must possess
User Interaction
Required (R)
Captures the requirement for a human user participation
Scope
Unchanged (U)
Determines if a successful attack impacts components beyond the vulnerable component
Confidentiality Impact
High (H)
Measures the impact to the confidentiality of information
Integrity Impact
High (H)
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
None (N)
Measures the impact to the availability of the impacted component
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.
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Sources
CWEs
Related Vulnerabilities
Exploits
Exploit ID: CVE-2025-26465
Source: github-poc
URL: https://github.com/dolutech/patch-manual-CVE-2025-26465-e-CVE-2025-26466
Vulnerable Software (28)
Type: Configuration
Product: openssh
Operating System: debian
{ "fixed": "1:9.9p2-1"}
Source: debian
Type: Configuration
Product: openssh
Operating System: astra 1.7.7.6
{ "unaffected": true}
Source: astra
Type: Configuration
Product: openssh
Operating System: astra 4.7.7.4
{ "unaffected": true}
Source: astra
Type: Configuration
Product: openssh
Operating System: ubuntu focal 20.04
{ "fixed": "1:8.2p1-4ubuntu0.12"}
Source: ubuntu
Type: Configuration
Product: openssh
Operating System: ubuntu jammy 22.04
{ "fixed": "1:8.9p1-3ubuntu0.11"}
Source: ubuntu
Type: Configuration
Product: openssh
Operating System: ubuntu noble 24.04
{ "fixed": "1:9.6p1-3ubuntu13.8"}
Source: ubuntu
Type: Configuration
Product: openssh
Operating System: ubuntu oracular 24.10
{ "fixed": "1:9.7p1-7ubuntu4.2"}
Source: ubuntu
Type: Configuration
Product: openssh
Operating System: ubuntu plucky 25.04
{ "fixed": "9.9p1-3ubuntu3"}
Source: ubuntu
Type: Configuration
Product: openssh
Operating System: ubuntu questing 25.10
{ "fixed": "9.9p1-3ubuntu3"}
Source: ubuntu
Type: Configuration
Product: openssh-askpass-common-gostcrypto
Operating System: altlinux
{ "fixed": "0:7.9p1-alt4.gost.p10.4"}
Source: redhat
Type: Configuration
Product: openssh-clients-gostcrypto
Operating System: altlinux
{ "fixed": "0:7.9p1-alt4.gost.p10.4"}
Source: redhat
Type: Configuration
Product: openssh-common-gostcrypto
Operating System: altlinux
{ "fixed": "0:7.9p1-alt4.gost.p10.4"}
Source: redhat
Type: Configuration
Product: openssh-gostcrypto
Operating System: altlinux
{ "fixed": "0:7.9p1-alt4.gost.p10.4"}
Source: redhat
Type: Configuration
Product: openssh-keysign-gostcrypto
Operating System: altlinux
{ "fixed": "0:7.9p1-alt4.gost.p10.4"}
Source: redhat
Type: Configuration
Product: openssh-server-control-gostcrypto
Operating System: altlinux
{ "fixed": "0:7.9p1-alt4.gost.p10.4"}
Source: redhat
Type: Configuration
Product: openssh-server-gostcrypto
Operating System: altlinux
{ "fixed": "0:7.9p1-alt4.gost.p10.4"}
Source: redhat
Type: Configuration
Product: openssh-ssh1
Operating System: ubuntu jammy 22.04
{ "unfixed": true}
Source: ubuntu
Type: Configuration
Product: openssh-ssh1
Operating System: ubuntu noble 24.04
{ "unfixed": true}
Source: ubuntu
Type: Configuration
Product: openssh-ssh1
Operating System: ubuntu oracular 24.10
{ "unfixed": true}
Source: ubuntu
Type: Configuration
Product: openssh-ssh1
Operating System: ubuntu plucky 25.04
{ "unfixed": true}
Source: ubuntu