CVE-2025-26466
Medium
Description
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.
SeverityMedium
CVSS5.9
Exploit probability99. percentile38.7%
Product
Openbsd Openssh
PublishedFeb 28, 2025
First seenFeb 28, 2025
Weakness typeCWE-770Allocation of resources without limits
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openbsd openssh | 9.5, 9.6, 9.7, 9.8, 9.9 | — |
| canonical ubuntu_linux | 24.04, 24.10 | — |
| debian debian_linux | 11.0, 12.0, 13.0 | — |
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