CVE-2026-42771

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.1", "status": "affected", "version": "4.0.0", "versionType": "semver"}]}], "source": "openssl-security@openssl.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*", "matchCriteriaId": "6E881B9A-1A0A-4BC0-8160-20C00561167D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "Resumen del problema: Cuando una aplicaci\u00f3n llama a X509_VERIFY_PARAM_set1_email para validar una direcci\u00f3n de correo electr\u00f3nico manipulada, como durante la validaci\u00f3n de mensajes S/MIME, puede ocurrir una lectura fuera de l\u00edmites.\n\nResumen del impacto: Esta lectura fuera de l\u00edmites no exfiltrar\u00e1 directamente los datos le\u00eddos al atacante, por lo que el resultado m\u00e1s probable es un fallo y una denegaci\u00f3n de servicio.\n\nUna funci\u00f3n auxiliar interna llamada desde X509_VERIFY_PARAM_[set|add]_email() utiliz\u00f3 una longitud incorrecta al validar la parte local de una direcci\u00f3n de correo electr\u00f3nico. Esto podr\u00eda causar que no se aplicara el l\u00edmite de 64 octetos en la parte local de una direcci\u00f3n de correo electr\u00f3nico, o causar una lectura fuera de l\u00edmites y potencialmente un fallo.\n\nEl error es alcanzable a trav\u00e9s de la validaci\u00f3n S-MIME con una direcci\u00f3n From: manipulada proporcionada en un mensaje de correo electr\u00f3nico que puede causar potencialmente un fallo.\n\nNing\u00fan m\u00f3dulo FIPS se ve afectado por este problema, ya que el c\u00f3digo afectado est\u00e1 fuera del l\u00edmite del m\u00f3dulo FIPS de OpenSSL."}], "id": "CVE-2026-42771", "lastModified": "2026-07-23T08:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42771", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-09T18:59:41.123767Z", "version": "2.0.3"}}]}, "published": "2026-06-09T17:17:08.663", "references": [{"source": "openssl-security@openssl.org", "tags": ["Patch"], "url": "https://github.com/openssl/openssl/commit/6cd187689f8180c1f8a3acde21f88190c4a20de7"}, {"source": "openssl-security@openssl.org", "tags": ["Vendor Advisory"], "url": "https://openssl-library.org/news/secadv/20260609.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{"bugzilla": {"description": "openssl: Possible Out of Bounds Read in X509_VERIFY_PARAM_set1_email()", "id": "2481895", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481895"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-805", "details": ["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.\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.\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.\nThe bug is reachable via S-MIME validation with a crafted From: address\nsupplied in an email message that can potentially cause a crash.\nNo FIPS modules are affected by this issue as the affected code is outside\nthe OpenSSL FIPS module boundary.", "A flaw was found in OpenSSL. When an application uses the X509_VERIFY_PARAM_set1_email() function to validate a specially crafted S/MIME (Secure/Multipurpose Internet Mail Extensions) email address, an out-of-bounds read can occur. A remote attacker could exploit this vulnerability by sending a malicious email, leading to an application crash and a Denial of Service (DoS). This issue does not directly expose sensitive data."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-42771", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "ovmf", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "compat-openssl10", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "mingw-openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Out of support scope", "package_name": "compat-openssl11", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-07-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-42771\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42771"], "statement": "This flaw is rated as Low impact. A possible out-of-bounds read in OpenSSL's X509_VERIFY_PARAM_set1_email() function can occur when an application validates a specially crafted S/MIME email address. This could lead to a denial of service through an application crash, but does not directly exfiltrate data.", "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.0.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "OpenSSL", "source": "cna", "vendor": "OpenSSL"}, "product": "openssl", "vendor": "openssl"}], "created": "2026-06-09T17:45:09.848571+00:00", "updated": "2026-07-30T00:15:03.715373+00:00", "vendors": ["openssl", "openssl$PRODUCT$openssl"]}