ghsa-m92w-x6j2-5gc5
Vulnerability from github
Published
2025-03-01 00:31
Modified
2025-03-05 06:31
Severity ?
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-26466"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-28T22:15:40Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-m92w-x6j2-5gc5",
  "modified": "2025-03-05T06:31:39Z",
  "published": "2025-03-01T00:31:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-26466"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2025-26466"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2345043"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1237041"
    },
    {
      "type": "WEB",
      "url": "https://security-tracker.debian.org/tracker/CVE-2025-26466"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20250228-0002"
    },
    {
      "type": "WEB",
      "url": "https://ubuntu.com/security/CVE-2025-26466"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2025/02/18/1"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2025/02/18/4"
    },
    {
      "type": "WEB",
      "url": "https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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