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CVE-2025-26466— Openssh: denial-of-service in openssh

Quick assessment

Affected
CVE-2025-26466
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenSSH（OpenBSD Secure Shell）是加拿大OpenBSD计划组的一套用于安全访问远程计算机的连接工具。该工具是SSH协议的开源实现，支持对所有的传输进行加密，可有效阻止窃听、连接劫持以及其他网络级的攻击。 OpenSSH 9.5p1版本至9.9p1版本存在资源管理错误漏洞，该漏洞源于恶意客户端发送大量ping包，导致内存消耗失控，可能引发拒绝服务。

CVSS 5.9 · Medium EPSS 39.85% · P99

Affected Version Matrix 7

VendorProduct Version RangeStatus
None None 9.5p1≤ 9.9p1 affected
Red Hat Red Hat Enterprise Linux 10 any unaffected
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
Red Hat Red Hat Enterprise Linux 9 any unaffected
Red Hat Red Hat OpenShift Container Platform 4 any unaffected

I. Basic Information for CVE-2025-26466

Vulnerability Information
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Vulnerability Title
Openssh: denial-of-service in openssh
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSH 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSSH（OpenBSD Secure Shell）是加拿大OpenBSD计划组的一套用于安全访问远程计算机的连接工具。该工具是SSH协议的开源实现，支持对所有的传输进行加密，可有效阻止窃听、连接劫持以及其他网络级的攻击。 OpenSSH 9.5p1版本至9.9p1版本存在资源管理错误漏洞，该漏洞源于恶意客户端发送大量ping包，导致内存消耗失控，可能引发拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 9.5p1 ~ 9.9p1 -
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2025-26466

# POC Description Source Link Shenlong Link
1 The OpenSSH client and server are vulnerable to a pre-authentication DoS attack between versions 9.5p1 to 9.9p1 (inclusive) that causes memory and CPU consumption https://github.com/rxerium/CVE-2025-26466 POC Details
2 OpenSSH server 9.5p1 - 9.9p1 DoS (PoC) https://github.com/jhonnybonny/CVE-2025-26466 POC Details
3 CVE-2025-26466 - SSH Ping DoS Ruby module for Metasploit Framework https://github.com/mrowkoob/CVE-2025-26466-msf POC Details
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III. Intelligence Information for CVE-2025-26466

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Vendor Advisories for CVE-2025-26466 (2)

Mailing List Discussions for CVE-2025-26466 (1)

IV. Related Vulnerabilities

Same weakness: CWE-770

V. Comments for CVE-2025-26466

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