{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-9076", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-05-20T12:43:37.677Z", "datePublished": "2026-06-09T16:03:16.306Z", "dateUpdated": "2026-06-09T16:03:16.306Z"}, "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": "Bhabani Sankar Das"}, {"lang": "en", "type": "reporter", "value": "Haruki Oyama (Waseda University)"}, {"lang": "en", "type": "remediation developer", "value": "Nikola Pajkovsky"}], "datePublic": "2026-06-09T14:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: When CMS password-based decryption (RFC 3211 / PWRI key unwrap)<br>processes attacker-supplied CMS data, an attacker-chosen stream-mode KEK<br>cipher can trigger a heap out-of-bounds read in kek_unwrap_key().<br><br>Impact summary: A heap buffer over-read may trigger a crash which leads to<br>Denial of Service for an application if the input buffer ends at a memory<br>page boundary and the following page is unmapped. There is no information<br>disclosure as the over-read bytes are not revealed to the attacker.<br><br>The key unwrapping function performs a check-byte test as specified in the<br>RFC that reads 7 bytes from a heap allocation that is based on the wrapped<br>key length from the message. There is a minimum length check based on the<br>block length of the wrapping cipher. However the cipher is selected from<br>an OID carried in the attacker's PWRI keyEncryptionAlgorithm with no<br>requirement that the cipher be a block cipher. When an attacker selects<br>a stream-mode cipher the guard will be ineffective and the allocated buffer<br>containing the unwrapped key can be too small to fit the check-bytes<br>specified in the RFC and a buffer over-read can happen.<br><br>Applications calling CMS_decrypt() or CMS_decrypt_set1_password()<br>(equivalently openssl cms -decrypt -pwri_password ...) on untrusted CMS<br>data are vulnerable to this issue. No password knowledge is required: the<br>over-read happens during the unwrap attempt before any authentication<br>succeeds.<br><br>The over-read is limited to a few bytes and is not written to output, so<br>there is no information disclosure. Triggering a crash requires the<br>allocation to border unmapped memory, which is unlikely with the normal<br>allocator.<br><br>The FIPS modules are not affected by this issue."}], "value": "Issue summary: When CMS password-based decryption (RFC 3211 / PWRI key unwrap)\nprocesses attacker-supplied CMS data, an attacker-chosen stream-mode KEK\ncipher can trigger a heap out-of-bounds read in kek_unwrap_key().\n\nImpact summary: A heap buffer over-read may trigger a crash which leads to\nDenial of Service for an application if the input buffer ends at a memory\npage boundary and the following page is unmapped. There is no information\ndisclosure as the over-read bytes are not revealed to the attacker.\n\nThe key unwrapping function performs a check-byte test as specified in the\nRFC that reads 7 bytes from a heap allocation that is based on the wrapped\nkey length from the message. There is a minimum length check based on the\nblock length of the wrapping cipher. However the cipher is selected from\nan OID carried in the attacker's PWRI keyEncryptionAlgorithm with no\nrequirement that the cipher be a block cipher. When an attacker selects\na stream-mode cipher the guard will be ineffective and the allocated buffer\ncontaining the unwrapped key can be too small to fit the check-bytes\nspecified in the RFC and a buffer over-read can happen.\n\nApplications calling CMS_decrypt() or CMS_decrypt_set1_password()\n(equivalently openssl cms -decrypt -pwri_password ...) on untrusted CMS\ndata are vulnerable to this issue. No password knowledge is required: the\nover-read happens during the unwrap attempt before any authentication\nsucceeds.\n\nThe over-read is limited to a few bytes and is not written to output, so\nthere is no information disclosure. Triggering a crash requires the\nallocation to border unmapped memory, which is unlikely with the normal\nallocator.\n\nThe FIPS modules are not affected by this issue."}], "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": "2026-06-09T16:03:16.306Z"}, "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/3d8d5bc1056b2f62da9fede23fedbf47e85187b0"}, {"name": "3.6.3 git commit", "tags": ["patch"], "url": "https://github.com/openssl/security/commit/77bf00ab13f6ff5e516535432f0328ed70ec0c26"}, {"name": "3.5.7 git commit", "tags": ["patch"], "url": "https://github.com/openssl/security/commit/715349a1d7c6db970e6815dafb90915f07307f98"}, {"name": "3.4.6 git commit", "tags": ["patch"], "url": "https://github.com/openssl/security/commit/05b066366842f930fadd9a6e94df98030af431bb"}, {"name": "3.0.21 git commit", "tags": ["patch"], "url": "https://github.com/openssl/security/commit/eecbe330977e8d023aae1ca2d9bdbe983ef3fdc6"}], "source": {"discovery": "UNKNOWN"}, "title": "Out-of-Bounds Read in CMS Password-Based Decryption", "x_generator": {"engine": "Vulnogram 0.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Issue summary: When CMS password-based decryption (RFC 3211 / PWRI key unwrap)\nprocesses attacker-supplied CMS data, an attacker-chosen stream-mode KEK\ncipher can trigger a heap out-of-bounds read in kek_unwrap_key().\n\nImpact summary: A heap buffer over-read may trigger a crash which leads to\nDenial of Service for an application if the input buffer ends at a memory\npage boundary and the following page is unmapped. There is no information\ndisclosure as the over-read bytes are not revealed to the attacker.\n\nThe key unwrapping function performs a check-byte test as specified in the\nRFC that reads 7 bytes from a heap allocation that is based on the wrapped\nkey length from the message. There is a minimum length check based on the\nblock length of the wrapping cipher. However the cipher is selected from\nan OID carried in the attacker's PWRI keyEncryptionAlgorithm with no\nrequirement that the cipher be a block cipher. When an attacker selects\na stream-mode cipher the guard will be ineffective and the allocated buffer\ncontaining the unwrapped key can be too small to fit the check-bytes\nspecified in the RFC and a buffer over-read can happen.\n\nApplications calling CMS_decrypt() or CMS_decrypt_set1_password()\n(equivalently openssl cms -decrypt -pwri_password ...) on untrusted CMS\ndata are vulnerable to this issue. No password knowledge is required: the\nover-read happens during the unwrap attempt before any authentication\nsucceeds.\n\nThe over-read is limited to a few bytes and is not written to output, so\nthere is no information disclosure. Triggering a crash requires the\nallocation to border unmapped memory, which is unlikely with the normal\nallocator.\n\nThe FIPS modules are not affected by this issue."}], "id": "CVE-2026-9076", "lastModified": "2026-06-09T17:17:50.997", "metrics": {}, "published": "2026-06-09T17:17:50.997", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/security/commit/05b066366842f930fadd9a6e94df98030af431bb"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/security/commit/3d8d5bc1056b2f62da9fede23fedbf47e85187b0"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/security/commit/715349a1d7c6db970e6815dafb90915f07307f98"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/security/commit/77bf00ab13f6ff5e516535432f0328ed70ec0c26"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/security/commit/eecbe330977e8d023aae1ca2d9bdbe983ef3fdc6"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260609.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Received", "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": "2026-06-09T17:45:09.854046+00:00", "updated": "2026-06-09T17:45:10.153828+00:00", "vendors": ["openssl", "openssl$PRODUCT$openssl"]}