CVE-2026-28389 (GCVE-0-2026-28389)

Vulnerability from cvelistv5 – Published: 2026-04-07 22:00 – Updated: 2026-05-12 12:09
VLAI
Title
Possible NULL Dereference When Processing CMS KeyAgreeRecipientInfo
Summary
Issue summary: During processing of a crafted CMS EnvelopedData message with KeyAgreeRecipientInfo a NULL pointer dereference can happen. Impact summary: Applications that process attacker-controlled CMS data may crash before authentication or cryptographic operations occur resulting in Denial of Service. When a CMS EnvelopedData message that uses KeyAgreeRecipientInfo is processed, the optional parameters field of KeyEncryptionAlgorithmIdentifier is examined without checking for its presence. This results in a NULL pointer dereference if the field is missing. Applications and services that call CMS_decrypt() on untrusted input (e.g., S/MIME processing or CMS-based protocols) are vulnerable. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
Severity
No CVSS data available.
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.6.0 , < 3.6.2 (semver)
Affected: 3.5.0 , < 3.5.6 (semver)
Affected: 3.4.0 , < 3.4.5 (semver)
Affected: 3.3.0 , < 3.3.7 (semver)
Affected: 3.0.0 , < 3.0.20 (semver)
Affected: 1.1.1 , < 1.1.1zg (custom)
Affected: 1.0.2 , < 1.0.2zp (custom)
Create a notification for this product.
Date Public
2026-04-07 14:00
Credits
Nathan Sportsman (Praetorian) Daniel Rhea Jaeho Nam (Seoul National University) Muhammad Daffa Zhanpeng Liu (Tencent Xuanwu Lab) Guannan Wang (Tencent Xuanwu Lab) Guancheng Li (Tencent Xuanwu Lab) Joshua Rogers (Aisle Research) Neil Horman
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-28389",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-10T20:20:14.953384Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-10T20:20:45.506Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "affected": [
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC CN 4100",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "V5.0",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-12T12:09:01.089Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
          }
        ],
        "x_adpType": "supplier"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "OpenSSL",
          "vendor": "OpenSSL",
          "versions": [
            {
              "lessThan": "3.6.2",
              "status": "affected",
              "version": "3.6.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.5.6",
              "status": "affected",
              "version": "3.5.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.4.5",
              "status": "affected",
              "version": "3.4.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.3.7",
              "status": "affected",
              "version": "3.3.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.0.20",
              "status": "affected",
              "version": "3.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.1.1zg",
              "status": "affected",
              "version": "1.1.1",
              "versionType": "custom"
            },
            {
              "lessThan": "1.0.2zp",
              "status": "affected",
              "version": "1.0.2",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Nathan Sportsman (Praetorian)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Daniel Rhea"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Jaeho Nam (Seoul National University)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Muhammad Daffa"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Zhanpeng Liu (Tencent Xuanwu Lab)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Guannan Wang (Tencent Xuanwu Lab)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Guancheng Li (Tencent Xuanwu Lab)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Joshua Rogers (Aisle Research)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Neil Horman"
        }
      ],
      "datePublic": "2026-04-07T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Issue summary: During processing of a crafted CMS EnvelopedData message\u003cbr\u003ewith KeyAgreeRecipientInfo a NULL pointer dereference can happen.\u003cbr\u003e\u003cbr\u003eImpact summary: Applications that process attacker-controlled CMS data may\u003cbr\u003ecrash before authentication or cryptographic operations occur resulting in\u003cbr\u003eDenial of Service.\u003cbr\u003e\u003cbr\u003eWhen a CMS EnvelopedData message that uses KeyAgreeRecipientInfo is\u003cbr\u003eprocessed, the optional parameters field of KeyEncryptionAlgorithmIdentifier\u003cbr\u003eis examined without checking for its presence. This results in a NULL\u003cbr\u003epointer dereference if the field is missing.\u003cbr\u003e\u003cbr\u003eApplications and services that call CMS_decrypt() on untrusted input\u003cbr\u003e(e.g., S/MIME processing or CMS-based protocols) are vulnerable.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this\u003cbr\u003eissue, as the affected code is outside the OpenSSL FIPS module boundary."
            }
          ],
          "value": "Issue summary: During processing of a crafted CMS EnvelopedData message\nwith KeyAgreeRecipientInfo a NULL pointer dereference can happen.\n\nImpact summary: Applications that process attacker-controlled CMS data may\ncrash before authentication or cryptographic operations occur resulting in\nDenial of Service.\n\nWhen a CMS EnvelopedData message that uses KeyAgreeRecipientInfo is\nprocessed, the optional parameters field of KeyEncryptionAlgorithmIdentifier\nis examined without checking for its presence. This results in a NULL\npointer dereference if the field is missing.\n\nApplications and services that call CMS_decrypt() on untrusted input\n(e.g., S/MIME processing or CMS-based protocols) are vulnerable.\n\nThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this\nissue, as the affected code is outside the OpenSSL FIPS module boundary."
        }
      ],
      "metrics": [
        {
          "format": "other",
          "other": {
            "content": {
              "text": "Low"
            },
            "type": "https://openssl-library.org/policies/general/security-policy/"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-476",
              "description": "CWE-476 NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-15T07:28:13.700Z",
        "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "shortName": "openssl"
      },
      "references": [
        {
          "name": "OpenSSL Advisory",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://openssl-library.org/news/secadv/20260407.txt"
        },
        {
          "name": "3.6.2 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/f80f83bc5fd036bc47d773e8b15a001e2b4ce686"
        },
        {
          "name": "3.5.6 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/16cea4188e0ea567deb4f93f85902247e67384f5"
        },
        {
          "name": "3.4.5 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/785cbf7ea3b5a6f5adf0c1ccb92b79d89c35c616"
        },
        {
          "name": "3.3.7 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/c6725634e089eb2b634b10ede33944be7248172a"
        },
        {
          "name": "3.0.20 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/7b5274e812400cacb6f3be4c2df5340923fa807f"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Possible NULL Dereference When Processing CMS KeyAgreeRecipientInfo",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
    "assignerShortName": "openssl",
    "cveId": "CVE-2026-28389",
    "datePublished": "2026-04-07T22:00:53.364Z",
    "dateReserved": "2026-02-27T13:45:02.161Z",
    "dateUpdated": "2026-05-12T12:09:01.089Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-28389",
      "date": "2026-05-27",
      "epss": "0.00113",
      "percentile": "0.29443"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-28389\",\"sourceIdentifier\":\"openssl-security@openssl.org\",\"published\":\"2026-04-07T22:16:21.030\",\"lastModified\":\"2026-05-12T13:17:33.637\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Issue summary: During processing of a crafted CMS EnvelopedData message\\nwith KeyAgreeRecipientInfo a NULL pointer dereference can happen.\\n\\nImpact summary: Applications that process attacker-controlled CMS data may\\ncrash before authentication or cryptographic operations occur resulting in\\nDenial of Service.\\n\\nWhen a CMS EnvelopedData message that uses KeyAgreeRecipientInfo is\\nprocessed, the optional parameters field of KeyEncryptionAlgorithmIdentifier\\nis examined without checking for its presence. This results in a NULL\\npointer dereference if the field is missing.\\n\\nApplications and services that call CMS_decrypt() on untrusted input\\n(e.g., S/MIME processing or CMS-based protocols) are vulnerable.\\n\\nThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this\\nissue, as the affected code is outside the OpenSSL FIPS module boundary.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"openssl-security@openssl.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.0.2\",\"versionEndExcluding\":\"1.0.2zp\",\"matchCriteriaId\":\"CE7957CC-80F0-4907-BFB5-AFB6994DDE3C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.1.1\",\"versionEndExcluding\":\"1.1.1zg\",\"matchCriteriaId\":\"656A0540-5825-498E-A7AB-C14976FEE45D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.0.0\",\"versionEndExcluding\":\"3.0.20\",\"matchCriteriaId\":\"B28A8143-89A4-4332-A1F8-A65FB5AA829F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.3.0\",\"versionEndExcluding\":\"3.3.7\",\"matchCriteriaId\":\"CF303B21-D9BF-461D-B7B0-A3FE1D557A9F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.4.0\",\"versionEndExcluding\":\"3.4.5\",\"matchCriteriaId\":\"DCCE43D0-8F17-475D-9EE6-842F758A9905\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.5.0\",\"versionEndExcluding\":\"3.5.6\",\"matchCriteriaId\":\"F6BC0271-444D-4597-BF05-DC60034EAA49\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.6.0\",\"versionEndExcluding\":\"3.6.2\",\"matchCriteriaId\":\"4A9E621D-29D8-418A-BF37-BED333C14507\"}]}]}],\"references\":[{\"url\":\"https://github.com/openssl/openssl/commit/16cea4188e0ea567deb4f93f85902247e67384f5\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/openssl/openssl/commit/785cbf7ea3b5a6f5adf0c1ccb92b79d89c35c616\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/openssl/openssl/commit/7b5274e812400cacb6f3be4c2df5340923fa807f\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/openssl/openssl/commit/c6725634e089eb2b634b10ede33944be7248172a\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/openssl/openssl/commit/f80f83bc5fd036bc47d773e8b15a001e2b4ce686\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://openssl-library.org/news/secadv/20260407.txt\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-032379.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-28389\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-10T20:20:14.953384Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-10T20:20:40.423Z\"}}], \"cna\": {\"title\": \"Possible NULL Dereference When Processing CMS KeyAgreeRecipientInfo\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Nathan Sportsman (Praetorian)\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Daniel Rhea\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Jaeho Nam (Seoul National University)\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Muhammad Daffa\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Zhanpeng Liu (Tencent Xuanwu Lab)\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Guannan Wang (Tencent Xuanwu Lab)\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Guancheng Li (Tencent Xuanwu Lab)\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Joshua Rogers (Aisle Research)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Neil Horman\"}], \"metrics\": [{\"other\": {\"type\": \"https://openssl-library.org/policies/general/security-policy/\", \"content\": {\"text\": \"Low\"}}, \"format\": \"other\"}], \"affected\": [{\"vendor\": \"OpenSSL\", \"product\": \"OpenSSL\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.6.0\", \"lessThan\": \"3.6.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.5.0\", \"lessThan\": \"3.5.6\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.4.0\", \"lessThan\": \"3.4.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.3.0\", \"lessThan\": \"3.3.7\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.0.0\", \"lessThan\": \"3.0.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.1.1\", \"lessThan\": \"1.1.1zg\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"1.0.2\", \"lessThan\": \"1.0.2zp\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-04-07T14:00:00.000Z\", \"references\": [{\"url\": \"https://openssl-library.org/news/secadv/20260407.txt\", \"name\": \"OpenSSL Advisory\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/f80f83bc5fd036bc47d773e8b15a001e2b4ce686\", \"name\": \"3.6.2 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/16cea4188e0ea567deb4f93f85902247e67384f5\", \"name\": \"3.5.6 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/785cbf7ea3b5a6f5adf0c1ccb92b79d89c35c616\", \"name\": \"3.4.5 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/c6725634e089eb2b634b10ede33944be7248172a\", \"name\": \"3.3.7 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/7b5274e812400cacb6f3be4c2df5340923fa807f\", \"name\": \"3.0.20 git commit\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Issue summary: During processing of a crafted CMS EnvelopedData message\\nwith KeyAgreeRecipientInfo a NULL pointer dereference can happen.\\n\\nImpact summary: Applications that process attacker-controlled CMS data may\\ncrash before authentication or cryptographic operations occur resulting in\\nDenial of Service.\\n\\nWhen a CMS EnvelopedData message that uses KeyAgreeRecipientInfo is\\nprocessed, the optional parameters field of KeyEncryptionAlgorithmIdentifier\\nis examined without checking for its presence. This results in a NULL\\npointer dereference if the field is missing.\\n\\nApplications and services that call CMS_decrypt() on untrusted input\\n(e.g., S/MIME processing or CMS-based protocols) are vulnerable.\\n\\nThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this\\nissue, as the affected code is outside the OpenSSL FIPS module boundary.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: During processing of a crafted CMS EnvelopedData message\u003cbr\u003ewith KeyAgreeRecipientInfo a NULL pointer dereference can happen.\u003cbr\u003e\u003cbr\u003eImpact summary: Applications that process attacker-controlled CMS data may\u003cbr\u003ecrash before authentication or cryptographic operations occur resulting in\u003cbr\u003eDenial of Service.\u003cbr\u003e\u003cbr\u003eWhen a CMS EnvelopedData message that uses KeyAgreeRecipientInfo is\u003cbr\u003eprocessed, the optional parameters field of KeyEncryptionAlgorithmIdentifier\u003cbr\u003eis examined without checking for its presence. This results in a NULL\u003cbr\u003epointer dereference if the field is missing.\u003cbr\u003e\u003cbr\u003eApplications and services that call CMS_decrypt() on untrusted input\u003cbr\u003e(e.g., S/MIME processing or CMS-based protocols) are vulnerable.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this\u003cbr\u003eissue, as the affected code is outside the OpenSSL FIPS module boundary.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-04-15T07:28:13.700Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-28389\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-15T07:28:13.700Z\", \"dateReserved\": \"2026-02-27T13:45:02.161Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-04-07T22:00:53.364Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.