CVE-2026-3497 (GCVE-0-2026-3497)
Vulnerability from cvelistv5
Published
2026-03-12 18:27
Modified
2026-03-18 18:20
Severity ?
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
CWE
  • CWE-908 - Use of Uninitialized Resource
Summary
Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange to the server, which will call the underlying function and continue the execution of the program without setting the related connection variables. As the variables are not initialized to NULL the code later accesses those uninitialized variables, accessing random memory, which could lead to undefined behavior. The recommended workaround is to use ssh_packet_disconnect() instead, which does terminate the process. The impact of the vulnerability depends heavily on the compiler flag hardening configuration.
References
Impacted products
Vendor Product Version
Ubuntu openssh Version: 1:10.0p1-5ubuntu5
Version: 1:9.6p1-3ubuntu13
Version: 1:8.9p1-3
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-3497",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-12T19:04:05.760026Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-12T19:04:27.229Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2026-03-18T18:20:11.514Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/12/3"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/14/3"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/14/4"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/18/2"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/18/4"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/18/5"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/18/7"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://launchpad.net/ubuntu/",
          "defaultStatus": "unaffected",
          "packageName": "openssh",
          "product": "openssh",
          "repo": "https://launchpad.net/ubuntu/+source/openssh",
          "vendor": "Ubuntu",
          "versions": [
            {
              "lessThan": "1:10.0p1-5ubuntu5.1",
              "status": "affected",
              "version": "1:10.0p1-5ubuntu5",
              "versionType": "dpkg"
            },
            {
              "lessThan": "1:9.6p1-3ubuntu13.15",
              "status": "affected",
              "version": "1:9.6p1-3ubuntu13",
              "versionType": "dpkg"
            },
            {
              "lessThan": "1:8.9p1-3ubuntu0.14",
              "status": "affected",
              "version": "1:8.9p1-3",
              "versionType": "dpkg"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Jeremy Brown"
        }
      ],
      "datePublic": "2026-03-12T18:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange to the server, which will call the underlying function and continue the execution of the program without setting the related connection variables. As the variables are not initialized to NULL the code later accesses those uninitialized variables, accessing random memory, which could lead to undefined behavior. The recommended workaround is to use ssh_packet_disconnect() instead, which does terminate the process. The impact of the vulnerability depends heavily on the compiler flag hardening configuration."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 2.7,
            "baseSeverity": "LOW",
            "exploitMaturity": "UNREPORTED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-908",
              "description": "CWE-908 Use of Uninitialized Resource",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-12T18:44:06.073Z",
        "orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
        "shortName": "canonical"
      },
      "references": [
        {
          "tags": [
            "vdb-entry"
          ],
          "url": "https://ubuntu.com/security/CVE-2026-3497"
        },
        {
          "url": "https://www.openwall.com/lists/oss-security/2026/03/12/3"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
    "assignerShortName": "canonical",
    "cveId": "CVE-2026-3497",
    "datePublished": "2026-03-12T18:27:44.917Z",
    "dateReserved": "2026-03-03T19:33:05.664Z",
    "dateUpdated": "2026-03-18T18:20:11.514Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2026/03/12/3\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2026/03/14/3\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2026/03/14/4\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2026/03/18/2\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2026/03/18/4\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2026/03/18/5\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2026/03/18/7\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2026-03-18T18:20:11.514Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-3497\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-12T19:04:05.760026Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-12T19:04:10.900Z\"}}], \"cna\": {\"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Jeremy Brown\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 2.7, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N\", \"exploitMaturity\": \"UNREPORTED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"LOW\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"LOW\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://launchpad.net/ubuntu/+source/openssh\", \"vendor\": \"Ubuntu\", \"product\": \"openssh\", \"versions\": [{\"status\": \"affected\", \"version\": \"1:10.0p1-5ubuntu5\", \"lessThan\": \"1:10.0p1-5ubuntu5.1\", \"versionType\": \"dpkg\"}, {\"status\": \"affected\", \"version\": \"1:9.6p1-3ubuntu13\", \"lessThan\": \"1:9.6p1-3ubuntu13.15\", \"versionType\": \"dpkg\"}, {\"status\": \"affected\", \"version\": \"1:8.9p1-3\", \"lessThan\": \"1:8.9p1-3ubuntu0.14\", \"versionType\": \"dpkg\"}], \"packageName\": \"openssh\", \"collectionURL\": \"https://launchpad.net/ubuntu/\", \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-03-12T18:00:00.000Z\", \"references\": [{\"url\": \"https://ubuntu.com/security/CVE-2026-3497\", \"tags\": [\"vdb-entry\"]}, {\"url\": \"https://www.openwall.com/lists/oss-security/2026/03/12/3\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange to the server, which will call the underlying function and continue the execution of the program without setting the related connection variables. As the variables are not initialized to NULL the code later accesses those uninitialized variables, accessing random memory, which could lead to undefined behavior. The recommended workaround is to use ssh_packet_disconnect() instead, which does terminate the process. The impact of the vulnerability depends heavily on the compiler flag hardening configuration.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-908\", \"description\": \"CWE-908 Use of Uninitialized Resource\"}]}], \"providerMetadata\": {\"orgId\": \"cc1ad9ee-3454-478d-9317-d3e869d708bc\", \"shortName\": \"canonical\", \"dateUpdated\": \"2026-03-12T18:44:06.073Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-3497\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-18T18:20:11.514Z\", \"dateReserved\": \"2026-03-03T19:33:05.664Z\", \"assignerOrgId\": \"cc1ad9ee-3454-478d-9317-d3e869d708bc\", \"datePublished\": \"2026-03-12T18:27:44.917Z\", \"assignerShortName\": \"canonical\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.