Vulnerability · NVD
CVE-2025-26466
MEDIUM 5.9
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.
Attack vector : Network
No privileges required
No user interaction
Show raw CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
39.85%
moderate exploit risk
percentile 98.5%
OS versions that fix this CVE
This CVE is resolved by the following OS security releases. Update the OS to at least the listed version.