CVE-2025-26466
MEDIUM | Platform: macOS | Changelog
CVE Details
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.
CVSS 3.1 Score
| Metric | Value |
|---|---|
| Base Score | 5.9 (MEDIUM) |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
Weakness
References
- Apple Security Advisory
- NVD Entry
- https://access.redhat.com/security/cve/CVE-2025-26466 (Third Party Advisory)
- https://bugzilla.redhat.com/show_bug.cgi?id=2345043 (Issue Tracking)
- https://seclists.org/oss-sec/2025/q1/144
- https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt (Third Party Advisory)
- http://seclists.org/fulldisclosure/2025/Feb/18
- http://seclists.org/fulldisclosure/2025/May/7
- http://seclists.org/fulldisclosure/2025/May/8
- https://bugzilla.suse.com/show_bug.cgi?id=1237041 (Third Party Advisory)