Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path during fips known-group validation leads to client-side denial of service

{
  "id": "2ad5767e2acbae81129cf06576eeb2028711ec3bb47d36f2bd9e25fee6a83306",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-55653",
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  "payload": {
    "kind": "advisory",
    "title": "Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path during fips known-group validation leads to client-side denial of service",
    "summary": "A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).",
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      "provider": "cve",
      "references": [
        "https://access.redhat.com/errata/RHSA-2026:36759",
        "https://access.redhat.com/errata/RHSA-2026:47755",
        "https://access.redhat.com/errata/RHSA-2026:47756",
        "https://access.redhat.com/errata/RHSA-2026:47757",
        "https://access.redhat.com/errata/RHSA-2026:54387",
        "https://access.redhat.com/errata/RHSA-2026:58981",
        "https://access.redhat.com/errata/RHSA-2026:76748",
        "https://access.redhat.com/errata/RHSA-2026:76993",
        "https://access.redhat.com/errata/RHSA-2026:80513",
        "https://access.redhat.com/errata/RHSA-2026:82749",
        "https://access.redhat.com/errata/RHSA-2026:82750",
        "https://access.redhat.com/errata/RHSA-2026:82751",
        "https://access.redhat.com/errata/RHSA-2026:82752",
        "https://access.redhat.com/errata/RHSA-2026:82753",
        "https://access.redhat.com/errata/RHSA-2026:82754",
        "https://access.redhat.com/errata/RHSA-2026:82755",
        "https://access.redhat.com/errata/RHSA-2026:82756",
        "https://access.redhat.com/errata/RHSA-2026:82757",
        "https://access.redhat.com/errata/RHSA-2026:82758",
        "https://access.redhat.com/errata/RHSA-2026:82759",
        "https://access.redhat.com/errata/RHSA-2026:82761",
        "https://access.redhat.com/errata/RHSA-2026:82762",
        "https://access.redhat.com/errata/RHSA-2026:82763",
        "https://access.redhat.com/errata/RHSA-2026:82897",
        "https://access.redhat.com/errata/RHSA-2026:82898",
        "https://access.redhat.com/errata/RHSA-2026:82899",
        "https://access.redhat.com/errata/RHSA-2026:82900",
        "https://access.redhat.com/errata/RHSA-2026:82901",
        "https://access.redhat.com/errata/RHSA-2026:82902",
        "https://access.redhat.com/errata/RHSA-2026:82903",
        "https://access.redhat.com/errata/RHSA-2026:82904",
        "https://access.redhat.com/errata/RHSA-2026:82907",
        "https://access.redhat.com/errata/RHSA-2026:82908",
        "https://access.redhat.com/errata/RHSA-2026:82909",
        "https://access.redhat.com/errata/RHSA-2026:82910",
        "https://access.redhat.com/errata/RHSA-2026:82912",
        "https://access.redhat.com/errata/RHSA-2026:82913",
        "https://access.redhat.com/errata/RHSA-2026:82914",
        "https://access.redhat.com/errata/RHSA-2026:82915",
        "https://access.redhat.com/errata/RHSA-2026:82916",
        "https://access.redhat.com/errata/RHSA-2026:82917",
        "https://access.redhat.com/errata/RHSA-2026:82918",
        "https://access.redhat.com/errata/RHSA-2026:82920",
        "https://access.redhat.com/errata/RHSA-2026:82921",
        "https://access.redhat.com/errata/RHSA-2026:82922",
        "https://access.redhat.com/errata/RHSA-2026:82923",
        "https://access.redhat.com/errata/RHSA-2026:89739",
        "https://access.redhat.com/security/cve/CVE-2026-55653",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2462351"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-55653",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
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                    "version": "2.0.3",
                    "timestamp": "2026-06-23T14:30:51.025049Z"
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            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-06-23T14:31:00.827Z"
            }
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        "cna": {
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          "shortName": "redhat",
          "dateUpdated": "2026-10-26T03:26:59.514Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-55653",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 239490,
  "published_at": "2026-06-23T03:36:22.741+00:00"
}