NIXPKGS-2025-0001
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.
- Issue status
- affected
- Created
- 13 May 2025
Vulnerabilities
- CVE-2025-26466
Related derivations
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openssh-9.9p1 (source)
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