CVE-2025-26466

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.

The following products are affected by CVE-2025-26466 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-26466.

URL	Resource
http://seclists.org/fulldisclosure/2025/Feb/18
http://seclists.org/fulldisclosure/2025/May/7
http://seclists.org/fulldisclosure/2025/May/8
https://access.redhat.com/security/cve/CVE-2025-26466
https://bugzilla.redhat.com/show_bug.cgi?id=2345043
https://bugzilla.suse.com/show_bug.cgi?id=1237041
https://nvd.nist.gov/vuln/detail/CVE-2025-26466
https://seclists.org/oss-sec/2025/q1/144
https://security-tracker.debian.org/tracker/CVE-2025-26466
https://security.netapp.com/advisory/ntap-20250228-0002/
https://ubuntu.com/security/CVE-2025-26466
https://www.cve.org/CVERecord?id=CVE-2025-26466
https://www.openwall.com/lists/oss-security/2025/02/18/1
https://www.openwall.com/lists/oss-security/2025/02/18/4
https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt
https://www.vicarius.io/vsociety/posts/cve-2025-26466-detection-script-memory-consumption-vulnerability-in-openssh
https://www.vicarius.io/vsociety/posts/cve-2025-26466-mitigation-script-memory-consumption-vulnerability-in-openssh