Allocation of Resources Without Limits or Throttling Affecting openssh-keycat package, versions <0:9.9p1-7.el10_0


Severity

Recommended
0.0
medium
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
40.65% (99th percentile)

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  • Snyk IDSNYK-CENTOS10-OPENSSHKEYCAT-10948083
  • published9 Oct 2026
  • disclosed18 Feb 2025

Introduced: 18 Feb 2025

CVE-2025-26466  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Centos:10 openssh-keycat to version 0:9.9p1-7.el10_0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh-keycat package and not the openssh-keycat package as distributed by Centos. See How to fix? for Centos:10 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1