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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

Type: advisorySource: Official CVE List1 source record

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).

Announced Source revision 1
Original source ↗

CVE-2026-55653

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-55653

Red Hat Enterprise Linux 10

Source reference: /containers/cna/affected/0/product

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Red Hat Enterprise Linux 10.0 Extended Update Support

Source reference: /containers/cna/affected/1/product

Affected versions
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Red Hat Enterprise Linux 8

Source reference: /containers/cna/affected/2/product

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Red Hat Enterprise Linux 8

Source reference: /containers/cna/affected/3/product

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Red Hat Enterprise Linux 9

Source reference: /containers/cna/affected/4/product

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Red Hat Enterprise Linux 9

Source reference: /containers/cna/affected/5/product

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Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Source reference: /containers/cna/affected/6/product

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Red Hat Enterprise Linux 9.6 Extended Update Support

Source reference: /containers/cna/affected/7/product

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Red Hat Hardened Images

Source reference: /containers/cna/affected/8/product

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Red Hat OpenShift AI 3.0

Source reference: /containers/cna/affected/9/product

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Red Hat OpenShift AI 3.0

Source reference: /containers/cna/affected/10/product

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Red Hat OpenShift AI 3.0

Source reference: /containers/cna/affected/11/product

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Red Hat OpenShift AI 3.0

Source reference: /containers/cna/affected/12/product

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Red Hat OpenShift AI 3.0

Source reference: /containers/cna/affected/13/product

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Red Hat OpenShift AI 3.2

Source reference: /containers/cna/affected/14/product

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Red Hat OpenShift AI 3.2

Source reference: /containers/cna/affected/15/product

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Red Hat OpenShift AI 3.2

Source reference: /containers/cna/affected/16/product

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Red Hat OpenShift AI 3.2

Source reference: /containers/cna/affected/17/product

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Red Hat OpenShift AI 3.2

Source reference: /containers/cna/affected/18/product

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Red Hat OpenShift AI 3.2

Source reference: /containers/cna/affected/19/product

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Red Hat OpenShift AI 3.3

Source reference: /containers/cna/affected/20/product

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Red Hat OpenShift AI 3.3

Source reference: /containers/cna/affected/21/product

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Red Hat OpenShift AI 3.3

Source reference: /containers/cna/affected/22/product

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Red Hat OpenShift AI 3.3

Source reference: /containers/cna/affected/23/product

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Red Hat OpenShift AI 3.3

Source reference: /containers/cna/affected/24/product

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Red Hat OpenShift AI 3.3

Source reference: /containers/cna/affected/25/product

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Red Hat OpenShift AI 3.3

Source reference: /containers/cna/affected/26/product

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Red Hat OpenShift AI 3.3

Source reference: /containers/cna/affected/27/product

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Red Hat OpenShift AI 3.4

Source reference: /containers/cna/affected/28/product

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Red Hat OpenShift AI 3.4

Source reference: /containers/cna/affected/29/product

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Red Hat OpenShift AI 3.4

Source reference: /containers/cna/affected/30/product

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Red Hat OpenShift AI 3.4

Source reference: /containers/cna/affected/31/product

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Red Hat OpenShift AI 3.4

Source reference: /containers/cna/affected/32/product

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Red Hat OpenShift AI 3.4

Source reference: /containers/cna/affected/33/product

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Red Hat OpenShift AI 3.4

Source reference: /containers/cna/affected/34/product

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Red Hat OpenShift AI 3.4

Source reference: /containers/cna/affected/35/product

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Red Hat OpenShift AI 3.4

Source reference: /containers/cna/affected/36/product

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Red Hat OpenShift AI 3.5

Source reference: /containers/cna/affected/37/product

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Red Hat OpenShift AI 3.5

Source reference: /containers/cna/affected/38/product

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Red Hat OpenShift AI 3.5

Source reference: /containers/cna/affected/39/product

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Red Hat OpenShift AI 3.5

Source reference: /containers/cna/affected/40/product

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Red Hat OpenShift AI 3.5

Source reference: /containers/cna/affected/41/product

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Red Hat OpenShift AI 3.5

Source reference: /containers/cna/affected/42/product

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Prerequisites
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Red Hat OpenShift AI 3.5

Source reference: /containers/cna/affected/43/product

Affected versions
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Prerequisites
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Red Hat OpenShift AI 3.5

Source reference: /containers/cna/affected/44/product

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Red Hat OpenShift AI 3.5

Source reference: /containers/cna/affected/45/product

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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/46/product

Affected versions
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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/47/product

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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/48/product

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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/49/product

Affected versions
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Fixed versions
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Red Hat Enterprise Linux 6

Source reference: /containers/cna/affected/50/product

Affected versions
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Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Red Hat Enterprise Linux 7

Source reference: /containers/cna/affected/51/product

Affected versions
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Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Red Hat OpenShift Container Platform 4

Source reference: /containers/cna/affected/52/product

Affected versions
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Red Hat OpenShift Container Platform 4

Source reference: /containers/cna/affected/53/product

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Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:10.2"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 10",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:9.9p1-25.el10_2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openssh",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/o:redhat:enterprise_linux_eus:10.0"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:9.9p1-7.el10_0.5",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openssh",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:8::appstream",
      "cpe:/o:redhat:enterprise_linux:8::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:8.0p1-30.el8_10",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openssh",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:8::appstream",
      "cpe:/o:redhat:enterprise_linux:8::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:8.0p1-30.el8_10",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openssh",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:9::appstream",
      "cpe:/o:redhat:enterprise_linux:9::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:9.9p1-9.el9_8",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openssh",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:9::appstream",
      "cpe:/o:redhat:enterprise_linux:9::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:9.9p1-9.el9_8",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openssh",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:9.4::appstream",
      "cpe:/o:redhat:rhel_e4s:9.4::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:8.7p1-38.el9_4.10",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openssh",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_eus:9.6::appstream",
      "cpe:/o:redhat:rhel_eus:9.6::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:8.7p1-45.el9_6.5",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openssh",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:hummingbird:1"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Hardened Images",
    "versions": [
      {
        "status": "unaffected",
        "version": "10.3p1-6.hum1",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openssh-main",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.0::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.0",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818590",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-cuda-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.0::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.0",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818589",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-cpu-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.0::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.0",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818505",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-spyre-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.0::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.0",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818496",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-tpu-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.0::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.0",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818502",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-rocm-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.2::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.2",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818602",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-spyre-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.2::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.2",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818598",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-cpu-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.2::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.2",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818512",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-tpu-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.2::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.2",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818587",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-cuda-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.2::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.2",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818778",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-rocm-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.2::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.2",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818512",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-rocm-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.3::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.3",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818782",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-tpu-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.3::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.3",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818782",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-rocm-6.4-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.3::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.3",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818627",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-cuda-12.9-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift_ai:3.3::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift AI 3.3",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791818790",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhai/base-image-rocm-7.0-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
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Related CVEs
CVE-2026-55653

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#23046 · Revision 1
Added to Heist Feed
Publisher date
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