CVE-2025-26466
MEDIUM 5 PoCs
HIGH
Priority: 2.28
BB Relevance:
80/100
Published: 2025-02-28
Modified: 2026-11-05
First seen: 2026-11-05
Status: active
Attack Surface
Network
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
High
PR:
None
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
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.
Weakness Classification (1)
Affected Software (15)
| Vendor | Product | Version |
|---|---|---|
| — | — | 9.5p1 |
| canonical | ubuntu_linux | 24.04 |
| canonical | ubuntu_linux | 24.10 |
| debian | debian_linux | 11.0 |
| debian | debian_linux | 12.0 |
| debian | debian_linux | 13.0 |
| openbsd | openssh | 9.5 |
| openbsd | openssh | 9.6 |
| openbsd | openssh | 9.6 |
| openbsd | openssh | 9.7 |
| openbsd | openssh | 9.7 |
| openbsd | openssh | 9.8 |
| openbsd | openssh | 9.8 |
| openbsd | openssh | 9.9 |
| openbsd | openssh | 9.9 |
References & Advisories (18)
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vdb-entry
x_refsource_REDHAT
issue-tracking
x_refsource_REDHAT
Third Party Advisory
Third Party Advisory
Third Party Advisory
Third Party Advisory
Mailing List
Third Party Advisory
Mailing List
Third Party Advisory