🛡️ CVE-2025-26466 — debian-linux
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.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.
Weakness class
CVE-2025-26466 is classified as CWE-770: Allocation of Resources Without Limits. Resources are allocated on request with no cap, so a client can exhaust them.
Affected software
CVE-2025-26466 is recorded against 3 packages.
- debian-linux
- openssh
- ubuntu-linux
Timeline and source
Published on 28 February 2025 and last revised on 30 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.
References
access.redhat.com
bugzilla.redhat.com
seclists.org
www.qualys.com
seclists.org
seclists.org
seclists.org
bugzilla.suse.com
security-tracker.debian.org
security.netapp.com
ubuntu.com
www.openwall.com
www.openwall.com
www.vicarius.io
www.vicarius.io
CVE-2025-26466 on other distributions
Each distribution ships its own build and its own fixed version. Pick the one you run:
Details
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| debian-linux | — | — |
| openssh | — | — |
| ubuntu-linux | — | — |
References
Similar Threats
- Critical CVE-2022-0194
- High CVE-2022-0367
- Medium CVE-2022-0171
- High CVE-2022-0135
- High CVE-2022-0204
More CVE 2025 advisories
Browse all of CVE 2025 in the advisory index.
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