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CVE-2025-26466 is a denial-of-service vulnerability in OpenSSH affecting SSH client and server handling of SSH2_MSG_PING packets during key exchange. For each ping packet received, the implementation allocates a corresponding pong packet in memory and places it into a queue. These queued allocations are not released until the client/server key exchange completes. A malicious peer can repeatedly send ping packets before authentication, causing unbounded growth of queued responses and uncontrolled memory consumption. This can exhaust available resources and disrupt the SSH service.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (2 hidden).
This repository contains a Metasploit auxiliary module (ping_dos.rb) that exploits CVE-2025-26466, a denial-of-service vulnerability in OpenSSH versions 9.5p1 to 9.9p1. The exploit works by sending a large number of SSH2_MSG_PING packets (type 192) to the target SSH server before authentication, which can exhaust the server's memory and CPU resources, potentially causing a lockup. The module allows configuration of the number of packets to send and optionally checks for a server response (SSH2_MSG_PONG). The README provides usage instructions for integrating the module into Metasploit and references to the CVE and related advisories. The main attack vector is network-based, targeting the SSH service (default port 22) on vulnerable OpenSSH servers. No hardcoded IPs or domains are present; the target is specified by the user at runtime.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A known SSH/OpenSSH vulnerability present on the operator's server, mentioned as part of the host's unpatched exposure.
DoS в OpenSSH из-за неограниченного выделения памяти во время key exchange, позволяющее удаленно вызвать отказ в обслуживании.
An OpenSSH vulnerability affecting both client and server that enables a pre-authentication denial-of-service attack.
A denial-of-service vulnerability in OpenSSH caused by unbounded memory allocation before authentication, allowing resource exhaustion via crafted SSH packets such as SSH2_MSG_PING.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.