{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-34180", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-03-26T09:29:36.012Z", "datePublished": "2026-06-09T16:03:17.082Z", "dateUpdated": "2026-06-09T19:02:24.228Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.1", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.3", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.7", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.6", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.0.21", "status": "affected", "version": "3.0.0", "versionType": "semver"}, {"lessThan": "1.1.1zh", "status": "affected", "version": "1.1.1", "versionType": "custom"}, {"lessThan": "1.0.2zq", "status": "affected", "version": "1.0.2", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Frank Buss"}, {"lang": "en", "type": "remediation developer", "value": "Viktor Dukhovni"}], "datePublic": "2026-06-09T14:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "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."}], "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. 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."}], "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": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-06-09T16:03:17.082Z"}, "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/security/commit/f696c73c3e61b8c502d040af62e690c060908a16"}, {"name": "3.6.3 git commit", "tags": ["patch"], "url": "https://github.com/openssl/security/commit/d93853c42110d6319e3df07842b488cb9f7ac5ff"}, {"name": "3.5.7 git commit", "tags": ["patch"], "url": "https://github.com/openssl/security/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43"}, {"name": "3.4.6 git commit", "tags": ["patch"], "url": "https://github.com/openssl/security/commit/1c6908e4fa5fa568752221d8eaf561a809751e5d"}, {"name": "3.0.21 git commit", "tags": ["patch"], "url": "https://github.com/openssl/security/commit/cbe418ae978539cf14a398a207dba834c0e93e83"}], "source": {"discovery": "UNKNOWN"}, "title": "Heap Buffer Over-read in ASN.1 Content Parsing", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"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": {"timestamp": "2026-06-09T19:00:59.503895Z", "id": "CVE-2026-34180", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-09T19:02:24.228Z"}}]}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "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. 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."}], "id": "CVE-2026-34180", "lastModified": "2026-06-09T19:38:32.463", "metrics": {}, "published": "2026-06-09T17:17:04.600", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/security/commit/1c6908e4fa5fa568752221d8eaf561a809751e5d"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/security/commit/cbe418ae978539cf14a398a207dba834c0e93e83"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/security/commit/d93853c42110d6319e3df07842b488cb9f7ac5ff"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/security/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/security/commit/f696c73c3e61b8c502d040af62e690c060908a16"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260609.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{}

{"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": "2026-06-09T18:00:11.643237+00:00", "vendors": ["openssl", "openssl$PRODUCT$openssl"]}