CVE-2026-42771 (GCVE-0-2026-42771)
Vulnerability from cvelistv5
Published
2026-06-09 16:03
Modified
2026-06-10 07:48
Severity ?
CWE
Summary
Issue summary: When the X509_VERIFY_PARAM_set1_email is called by an application to validate a crafted e-mail address, such as during S/MIME message validation, an out of bounds read can happen. Impact summary: This out of bounds read will not directly exfiltrate the data read to the attacker so the most likely result is a crash and a Denial of Service. An internal helper function called from X509_VERIFY_PARAM_[set|add]_email() used a wrong length when validating the local part of an email address. This could cause the 64 octet limit on the local part of an email address to be not enforced, or cause an out of bound read and potentially a crash. The bug is reachable via S-MIME validation with a crafted From: address supplied in an email message that can potentially cause a crash. No FIPS modules are affected by this issue as the affected code is outside the OpenSSL FIPS module boundary.
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Version: 4.0.0   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 6.2,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-42771",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-09T18:59:41.123767Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-09T19:00:12.343Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "OpenSSL",
          "vendor": "OpenSSL",
          "versions": [
            {
              "lessThan": "4.0.1",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "TrendAI Zero Day Initiative"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Bob Beck"
        }
      ],
      "datePublic": "2026-06-09T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Issue summary: When the X509_VERIFY_PARAM_set1_email is called by an\u003cbr\u003eapplication to validate a crafted e-mail address, such as during S/MIME\u003cbr\u003emessage validation, an out of bounds read can happen.\u003cbr\u003e\u003cbr\u003eImpact summary: This out of bounds read will not directly exfiltrate\u003cbr\u003ethe data read to the attacker so the most likely result is a crash and\u003cbr\u003ea Denial of Service.\u003cbr\u003e\u003cbr\u003eAn internal helper function called from X509_VERIFY_PARAM_[set|add]_email()\u003cbr\u003eused a wrong length when validating the local part of an email address.\u003cbr\u003eThis could cause the 64 octet limit on the local part of an email address\u003cbr\u003eto be not enforced, or cause an out of bound read and potentially a crash.\u003cbr\u003e\u003cbr\u003eThe bug is reachable via S-MIME validation with a crafted From: address\u003cbr\u003esupplied in an email message that can potentially cause a crash.\u003cbr\u003e\u003cbr\u003eNo FIPS modules are affected by this issue as the affected code is outside\u003cbr\u003ethe OpenSSL FIPS module boundary."
            }
          ],
          "value": "Issue summary: When the X509_VERIFY_PARAM_set1_email is called by an\napplication to validate a crafted e-mail address, such as during S/MIME\nmessage validation, an out of bounds read can happen.\n\nImpact summary: This out of bounds read will not directly exfiltrate\nthe data read to the attacker so the most likely result is a crash and\na Denial of Service.\n\nAn internal helper function called from X509_VERIFY_PARAM_[set|add]_email()\nused a wrong length when validating the local part of an email address.\nThis could cause the 64 octet limit on the local part of an email address\nto be not enforced, or cause an out of bound read and potentially a crash.\n\nThe bug is reachable via S-MIME validation with a crafted From: address\nsupplied in an email message that can potentially cause a crash.\n\nNo FIPS modules are affected by this issue as the affected code is outside\nthe OpenSSL FIPS module boundary."
        }
      ],
      "metrics": [
        {
          "format": "other",
          "other": {
            "content": {
              "text": "Low"
            },
            "type": "https://openssl-library.org/policies/general/security-policy/"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-10T07:48:09.673Z",
        "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "shortName": "openssl"
      },
      "references": [
        {
          "name": "OpenSSL Advisory",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://openssl-library.org/news/secadv/20260609.txt"
        },
        {
          "name": "4.0.1 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/6cd187689f8180c1f8a3acde21f88190c4a20de7"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Possible Out of Bounds Read in X509_VERIFY_PARAM_set1_email()",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
    "assignerShortName": "openssl",
    "cveId": "CVE-2026-42771",
    "datePublished": "2026-06-09T16:03:30.565Z",
    "dateReserved": "2026-04-29T09:22:27.969Z",
    "dateUpdated": "2026-06-10T07:48:09.673Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.2, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/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-2026-42771\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-09T18:59:41.123767Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-09T18:59:55.796Z\"}}], \"cna\": {\"title\": \"Possible Out of Bounds Read in X509_VERIFY_PARAM_set1_email()\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"TrendAI Zero Day Initiative\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Bob Beck\"}], \"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\": \"4.0.0\", \"lessThan\": \"4.0.1\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-06-09T14:00:00.000Z\", \"references\": [{\"url\": \"https://openssl-library.org/news/secadv/20260609.txt\", \"name\": \"OpenSSL Advisory\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/6cd187689f8180c1f8a3acde21f88190c4a20de7\", \"name\": \"4.0.1 git commit\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Issue summary: When the X509_VERIFY_PARAM_set1_email is called by an\\napplication to validate a crafted e-mail address, such as during S/MIME\\nmessage validation, an out of bounds read can happen.\\n\\nImpact summary: This out of bounds read will not directly exfiltrate\\nthe data read to the attacker so the most likely result is a crash and\\na Denial of Service.\\n\\nAn internal helper function called from X509_VERIFY_PARAM_[set|add]_email()\\nused a wrong length when validating the local part of an email address.\\nThis could cause the 64 octet limit on the local part of an email address\\nto be not enforced, or cause an out of bound read and potentially a crash.\\n\\nThe bug is reachable via S-MIME validation with a crafted From: address\\nsupplied in an email message that can potentially cause a crash.\\n\\nNo FIPS modules are affected by this issue as the affected code is outside\\nthe OpenSSL FIPS module boundary.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: When the X509_VERIFY_PARAM_set1_email is called by an\u003cbr\u003eapplication to validate a crafted e-mail address, such as during S/MIME\u003cbr\u003emessage validation, an out of bounds read can happen.\u003cbr\u003e\u003cbr\u003eImpact summary: This out of bounds read will not directly exfiltrate\u003cbr\u003ethe data read to the attacker so the most likely result is a crash and\u003cbr\u003ea Denial of Service.\u003cbr\u003e\u003cbr\u003eAn internal helper function called from X509_VERIFY_PARAM_[set|add]_email()\u003cbr\u003eused a wrong length when validating the local part of an email address.\u003cbr\u003eThis could cause the 64 octet limit on the local part of an email address\u003cbr\u003eto be not enforced, or cause an out of bound read and potentially a crash.\u003cbr\u003e\u003cbr\u003eThe bug is reachable via S-MIME validation with a crafted From: address\u003cbr\u003esupplied in an email message that can potentially cause a crash.\u003cbr\u003e\u003cbr\u003eNo FIPS modules are affected by this issue as the affected code is outside\u003cbr\u003ethe OpenSSL FIPS module boundary.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-06-10T07:48:09.673Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-42771\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-10T07:48:09.673Z\", \"dateReserved\": \"2026-04-29T09:22:27.969Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-06-09T16:03:30.565Z\", \"assignerShortName\": \"openssl\"}",
      "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.