GHSA-m92w-x6j2-5gc5MediumCVSS 5.9
A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong...
🔗 CVE IDs covered (1)
📋 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.
🔗 References (20)
- https://nvd.nist.gov/vuln/detail/CVE-2025-26466
- https://access.redhat.com/security/cve/CVE-2025-26466
- https://bugzilla.redhat.com/show_bug.cgi?id=2345043
- https://security.netapp.com/advisory/ntap-20250228-0002
- https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt
- https://bugzilla.suse.com/show_bug.cgi?id=1237041
- https://security-tracker.debian.org/tracker/CVE-2025-26466
- https://ubuntu.com/security/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://seclists.org/oss-sec/2025/q1/144
- http://seclists.org/fulldisclosure/2025/May/7
- http://seclists.org/fulldisclosure/2025/May/8
- http://seclists.org/fulldisclosure/2025/Feb/18
- 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
- https://access.redhat.com/errata/RHBA-2025:6305
- https://access.redhat.com/errata/RHSA-2025:6993
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://github.com/advisories/GHSA-m92w-x6j2-5gc5