CVE-2026-34180

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More typically such ASN.1 elements would instead be<br>truncated.<br><br>An integer truncation in OpenSSL's ASN.1 decoder causes the content length of<br>an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the<br>worst case the truncated length is treated as a request to scan the binary<br>content for a terminating zero byte, possibly causing OpenSSL to read either<br>less than or beyond the end of the allocated buffer.<br><br>Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or<br>any other d2i_* decoding function are affected. OpenSSL's own command-line<br>tools are not vulnerable, as data read through the BIO layer is checked before<br>it reaches the affected code. The issue only affects 64-bit Unix and Unix-like<br>platforms; 32-bit platforms and 64-bit Windows are not affected.<br><br>The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue,<br>as the affected code is outside the OpenSSL FIPS module boundary."}], "value": "Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive\nelement whose content exceeds 2 gigabytes in length may cause a heap buffer\nover-read on 64-bit Unix and Unix-like platforms.\n\nImpact summary: The heap buffer over-read may crash the application (Denial of\nService) or to load into the decoded ASN.1 object contents of memory beyond the\nend of the input buffer. More typically such ASN.1 elements would instead be\ntruncated.\n\nAn integer truncation in OpenSSL's ASN.1 decoder causes the content length of\nan ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the\nworst case the truncated length is treated as a request to scan the binary\ncontent for a terminating zero byte, possibly causing OpenSSL to read either\nless than or beyond the end of the allocated buffer.\n\nApplications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or\nany other d2i_* decoding function are affected. OpenSSL's own command-line\ntools are not vulnerable, as data read through the BIO layer is checked before\nit reaches the affected code. 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More typically such ASN.1 elements would instead be\ntruncated.\n\nAn integer truncation in OpenSSL's ASN.1 decoder causes the content length of\nan ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the\nworst case the truncated length is treated as a request to scan the binary\ncontent for a terminating zero byte, possibly causing OpenSSL to read either\nless than or beyond the end of the allocated buffer.\n\nApplications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or\nany other d2i_* decoding function are affected. OpenSSL's own command-line\ntools are not vulnerable, as data read through the BIO layer is checked before\nit reaches the affected code. The issue only affects 64-bit Unix and Unix-like\nplatforms; 32-bit platforms and 64-bit Windows are not affected.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue,\nas the affected code is outside the OpenSSL FIPS module boundary.", "supportingMedia": [{"type": "text/html", "value": "Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive<br>element whose content exceeds 2 gigabytes in length may cause a heap buffer<br>over-read on 64-bit Unix and Unix-like platforms.<br><br>Impact summary: The heap buffer over-read may crash the application (Denial of<br>Service) or to load into the decoded ASN.1 object contents of memory beyond the<br>end of the input buffer. More typically such ASN.1 elements would instead be<br>truncated.<br><br>An integer truncation in OpenSSL's ASN.1 decoder causes the content length of<br>an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the<br>worst case the truncated length is treated as a request to scan the binary<br>content for a terminating zero byte, possibly causing OpenSSL to read either<br>less than or beyond the end of the allocated buffer.<br><br>Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or<br>any other d2i_* decoding function are affected. OpenSSL's own command-line<br>tools are not vulnerable, as data read through the BIO layer is checked before<br>it reaches the affected code. The issue only affects 64-bit Unix and Unix-like<br>platforms; 32-bit platforms and 64-bit Windows are not affected.<br><br>The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue,<br>as the affected code is outside the 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": "2026-06-10T07:47:52.427Z"}}}, "cveMetadata": {"cveId": "CVE-2026-34180", "state": "PUBLISHED", "dateUpdated": "2026-06-10T07:47:52.427Z", "dateReserved": "2026-03-26T09:29:36.012Z", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "datePublished": "2026-06-09T16:03:17.082Z", "assignerShortName": "openssl"}, "dataVersion": "5.2"}

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More typically such ASN.1 elements would instead be\ntruncated.\n\nAn integer truncation in OpenSSL's ASN.1 decoder causes the content length of\nan ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the\nworst case the truncated length is treated as a request to scan the binary\ncontent for a terminating zero byte, possibly causing OpenSSL to read either\nless than or beyond the end of the allocated buffer.\n\nApplications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or\nany other d2i_* decoding function are affected. OpenSSL's own command-line\ntools are not vulnerable, as data read through the BIO layer is checked before\nit reaches the affected code. The issue only affects 64-bit Unix and Unix-like\nplatforms; 32-bit platforms and 64-bit Windows are not affected.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue,\nas the affected code is outside the OpenSSL FIPS module boundary."}, {"lang": "es", "value": "Resumen del problema: Analizar una estructura ASN.1 codificada en DER manipulada con un elemento primitivo cuyo contenido excede los 2 gigabytes de longitud puede causar una lectura excesiva del b\u00fafer de la pila (heap buffer over-read) en plataformas Unix y similares a Unix de 64 bits.\n\nResumen del impacto: La lectura excesiva del b\u00fafer de la pila puede bloquear la aplicaci\u00f3n (Denegaci\u00f3n de Servicio) o cargar en el objeto ASN.1 decodificado contenidos de memoria m\u00e1s all\u00e1 del final del b\u00fafer de entrada. M\u00e1s t\u00edpicamente, tales elementos ASN.1 ser\u00edan truncados en su lugar.\n\nUn truncamiento de entero en el decodificador ASN.1 de OpenSSL hace que la longitud del contenido de un elemento primitivo ASN.1 sea manejada incorrectamente cuando excede los 2 gigabytes. En el peor de los casos, la longitud truncada se trata como una solicitud para escanear el contenido binario en busca de un byte cero de terminaci\u00f3n, posiblemente causando que OpenSSL lea menos o m\u00e1s all\u00e1 del final del b\u00fafer asignado.\n\nLas aplicaciones que pasan datos suministrados por el atacante a d2i_X509(), d2i_PKCS7(), o cualquier otra funci\u00f3n de decodificaci\u00f3n d2i_* se ven afectadas. Las propias herramientas de l\u00ednea de comandos de OpenSSL no son vulnerables, ya que los datos le\u00eddos a trav\u00e9s de la capa BIO se verifican antes de que lleguen al c\u00f3digo afectado. El problema solo afecta a plataformas Unix y similares a Unix de 64 bits; las plataformas de 32 bits y Windows de 64 bits no se ven afectadas.\n\nLos m\u00f3dulos FIPS en 4.0, 3.6, 3.5, 3.4 y 3.0 no se ven afectados por este problema, ya que el c\u00f3digo afectado est\u00e1 fuera del l\u00edmite del m\u00f3dulo FIPS de OpenSSL."}], "id": "CVE-2026-34180", "lastModified": "2026-07-23T08:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34180", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-09T19:00:59.503895Z", "version": "2.0.3"}}]}, "published": "2026-06-09T17:17:04.600", "references": [{"source": "openssl-security@openssl.org", "tags": ["Patch"], "url": "https://github.com/openssl/openssl/commit/1c6908e4fa5fa568752221d8eaf561a809751e5d"}, {"source": "openssl-security@openssl.org", "tags": ["Patch"], "url": "https://github.com/openssl/openssl/commit/cbe418ae978539cf14a398a207dba834c0e93e83"}, {"source": "openssl-security@openssl.org", "tags": ["Patch"], "url": "https://github.com/openssl/openssl/commit/d93853c42110d6319e3df07842b488cb9f7ac5ff"}, {"source": "openssl-security@openssl.org", "tags": ["Patch"], "url": "https://github.com/openssl/openssl/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43"}, {"source": "openssl-security@openssl.org", "tags": ["Patch"], "url": "https://github.com/openssl/openssl/commit/f696c73c3e61b8c502d040af62e690c060908a16"}, {"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: OpenSSL: Heap buffer over-read in ASN.1 decoding can lead to denial of service or information disclosure.", "id": "2481881", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481881"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive\nelement whose content exceeds 2 gigabytes in length may cause a heap buffer\nover-read on 64-bit Unix and Unix-like platforms.\nImpact summary: The heap buffer over-read may crash the application (Denial of\nService) or to load into the decoded ASN.1 object contents of memory beyond the\nend of the input buffer. More typically such ASN.1 elements would instead be\ntruncated.\nAn integer truncation in OpenSSL's ASN.1 decoder causes the content length of\nan ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the\nworst case the truncated length is treated as a request to scan the binary\ncontent for a terminating zero byte, possibly causing OpenSSL to read either\nless than or beyond the end of the allocated buffer.\nApplications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or\nany other d2i_* decoding function are affected. OpenSSL's own command-line\ntools are not vulnerable, as data read through the BIO layer is checked before\nit reaches the affected code. The issue only affects 64-bit Unix and Unix-like\nplatforms; 32-bit platforms and 64-bit Windows are not affected.\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue,\nas the affected code is outside the OpenSSL FIPS module boundary.", "A flaw was found in OpenSSL. An integer truncation vulnerability in the ASN.1 decoder can occur when processing a crafted DER-encoded ASN.1 structure with a primitive element exceeding 2 gigabytes. A remote attacker could exploit this to cause a heap buffer over-read. This may lead to an application crash, resulting in a Denial of Service (DoS), or potentially disclose sensitive information by loading memory contents beyond the input buffer. This issue primarily affects 64-bit Unix and Unix-like platforms."], "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-2026-34180", "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": "Affected", "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": "Fix deferred", "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": "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": "2026-06-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34180\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34180"], "statement": "This Low impact vulnerability in OpenSSL's ASN.1 decoder affects 64-bit Unix-like platforms, where processing a crafted DER-encoded ASN.1 structure exceeding 2 gigabytes can lead to a heap buffer over-read. This may result in application crashes (Denial of Service) or unintended memory exposure. Red Hat products are only affected if they process untrusted, excessively large ASN.1 input using OpenSSL's d2i_* decoding functions.", "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.0.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.6.0,3.6.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.5.0,3.5.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.4.0,3.4.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.0,3.0.21)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.1.1,1.1.1zh)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.0.2,1.0.2zq)"}}], "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": "2026-06-09T17:30:10.521339+00:00", "updated": "2026-06-11T03:00:04.623525+00:00", "vendors": ["openssl", "openssl$PRODUCT$openssl"]}