Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination

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    "cveId": "CVE-2026-55654",
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    "assignerShortName": "redhat",
    "dateUpdated": "2026-07-08T13:59:46.550Z",
    "dateReserved": "2026-06-16T23:55:05.737Z",
    "datePublished": "2026-06-23T03:37:00.160Z",
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      "datePublic": "2026-06-22T23:18:14.750Z",
      "title": "Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination",
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service."
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      "affected": [
        {
          "vendor": "Red Hat",
          "product": "Red Hat Hardened Images",
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "packageName": "openssh-main",
          "cpes": [
            "cpe:/a:redhat:hummingbird:1"
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          "defaultStatus": "affected",
          "versions": [
            {
              "version": "10.3p1-6.hum1",
              "status": "unaffected",
              "versionType": "rpm",
              "lessThan": "*"
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        {
          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 10",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "openssh",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10"
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        {
          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 6",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "openssh",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:6"
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        {
          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 7",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "openssh",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:7"
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          "product": "Red Hat Enterprise Linux 8",
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            "cpe:/o:redhat:enterprise_linux:8"
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          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 9",
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          "packageName": "openssh",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
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          "defaultStatus": "affected"
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        {
          "vendor": "Red Hat",
          "product": "Red Hat OpenShift Container Platform 4",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "rhcos",
          "cpes": [
            "cpe:/a:redhat:openshift:4"
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          "defaultStatus": "unknown"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Out-of-bounds Read",
              "cweId": "CWE-125",
              "type": "CWE"
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      "references": [
        {
          "url": "https://access.redhat.com/errata/RHSA-2026:36759",
          "name": "RHSA-2026:36759",
          "tags": [
            "vendor-advisory",
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          "tags": [
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        {
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462493",
          "name": "RHBZ#2462493",
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            "issue-tracking",
            "x_refsource_REDHAT"
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            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "attackVector": "NETWORK",
            "attackComplexity": "HIGH",
            "privilegesRequired": "NONE",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "availabilityImpact": "LOW",
            "baseScore": 3.7,
            "baseSeverity": "LOW"
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      "timeline": [
        {
          "time": "2026-04-26T19:17:42.000Z",
          "lang": "en",
          "value": "Reported to Red Hat."
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          "time": "2026-06-22T23:18:14.750Z",
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