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Permalink CVE-2025-26466
5.9 MEDIUM
  • CVSS version: 3.1
  • Attack vector (AV): NETWORK
  • Attack complexity (AC): HIGH
  • Privileges required (PR): NONE
  • User interaction (UI): NONE
  • Scope (S): UNCHANGED
  • Confidentiality impact (C): NONE
  • Integrity impact (I): NONE
  • Availability impact (A): HIGH
created 6 months, 1 week ago
Openssh: denial-of-service in openssh

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.

References

Affected products

rhcos
OpenSSH
  • =<9.9p1
openssh

Matching in nixpkgs

pkgs.openssh

Implementation of the SSH protocol

  • nixos-unstable -

pkgs.openssh_hpn

Implementation of the SSH protocol with high performance networking patches

  • nixos-unstable -

pkgs.openssh_gssapi

Implementation of the SSH protocol with GSSAPI support

  • nixos-unstable -

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