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Openssh: denial-of-service in openssh

OpenSSH · CVE-2025-26466
0 news outlets0 CERTs and agencies0 researchers

What is it?

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.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
5.9
EPSS
40.6%
First seen
8 h ago
Status
corroborated

All OpenSSH vulnerabilities