{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63072", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-07-15T13:10:26.188Z", "datePublished": "2026-08-25T12:59:34.428Z", "dateUpdated": "2026-08-25T14:29:55.378Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.2", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.4", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.8", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.7", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.0.22", "status": "affected", "version": "3.0.0", "versionType": "semver"}, {"lessThan": "1.1.1zi", "status": "affected", "version": "1.1.1", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Bhabani Sankar Das"}, {"lang": "en", "type": "reporter", "value": "Filipe Casal(Trail of Bits)"}, {"lang": "en", "type": "remediation developer", "value": "Daniel Kubec"}], "datePublic": "2026-08-25T11:36:16.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based<br>on querying the unwrapped key size, but the AES-WRAP-PAD unwrap primitive<br>can write and cleanse more bytes than that query reports, causing an 8-byte<br>out-of-bounds heap write.<br><br>Impact summary: An attacker who supplies a crafted CMS message can trigger a<br>deterministic 8-byte out-of-bounds heap write when the victim decrypts it<br>with CMS_decrypt(), corrupting the heap and typically resulting in a Denial<br>of Service.<br><br>CWE: CWE-787: Out-of-bounds Write<br><br>Description: The key-wrap OID is potentially attacker-controlled on the wire.<br>CMS unwrapping allows both id-aesNNN-wrap-pad and id-aesNNN-wrap ciphers.<br>An attacker can take a legitimate message and change a single OID byte to<br>select the padded variant while leaving the message otherwise valid. Since<br>the unwrap key is derived from the recipient's private operation (ECDH key<br>agreement or ML-KEM decapsulation), the RFC 5649 integrity check cannot<br>pass, and the decryption fails with integrity failure.<br><br>The write is a fixed-size (8-byte), fixed-value (zero) heap overflow<br>immediately past the allocation, requires no special configuration, and is<br>reachable from the public CMS_decrypt() function. The consequence is<br>a heap corruption leading to a Denial of Service. The fix in the CMS code<br>sizes the unwrap output buffer for the worst case so a failed unwrap cannot<br>write past the allocation.<br><br>FIPS impact: no<br><br>As the CMS code lives outside the FIPS module boundary, no FIPS<br>modules are affected by this CVE."}], "value": "Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based\non querying the unwrapped key size, but the AES-WRAP-PAD unwrap primitive\ncan write and cleanse more bytes than that query reports, causing an 8-byte\nout-of-bounds heap write.\n\nImpact summary: An attacker who supplies a crafted CMS message can trigger a\ndeterministic 8-byte out-of-bounds heap write when the victim decrypts it\nwith CMS_decrypt(), corrupting the heap and typically resulting in a Denial\nof Service.\n\nCWE: CWE-787: Out-of-bounds Write\n\nDescription: The key-wrap OID is potentially attacker-controlled on the wire.\nCMS unwrapping allows both id-aesNNN-wrap-pad and id-aesNNN-wrap ciphers.\nAn attacker can take a legitimate message and change a single OID byte to\nselect the padded variant while leaving the message otherwise valid. Since\nthe unwrap key is derived from the recipient's private operation (ECDH key\nagreement or ML-KEM decapsulation), the RFC 5649 integrity check cannot\npass, and the decryption fails with integrity failure.\n\nThe write is a fixed-size (8-byte), fixed-value (zero) heap overflow\nimmediately past the allocation, requires no special configuration, and is\nreachable from the public CMS_decrypt() function. The consequence is\na heap corruption leading to a Denial of Service. The fix in the CMS code\nsizes the unwrap output buffer for the worst case so a failed unwrap cannot\nwrite past the allocation.\n\nFIPS impact: no\n\nAs the CMS code lives outside the FIPS module boundary, no FIPS\nmodules are affected by this CVE."}], "metrics": [{"format": "other", "other": {"content": {"text": "Moderate"}, "type": "https://openssl-library.org/policies/general/security-policy/"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-08-25T12:59:34.428Z"}, "references": [{"name": "OpenSSL Advisory", "tags": ["vendor-advisory"], "url": "https://openssl-library.org/news/secadv/20260825.txt"}, {"name": "4.0.2 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/9530a5fd1aacaeccdced4478ea2340a480613335"}, {"name": "3.6.4 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/2a3dac874c8057c1f0186849bf1ede1ae7b6b756"}, {"name": "3.5.8 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/87784ad619af36b8807c2044b3940006fccc1e42"}, {"name": "3.4.7 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/9ec2f6d2ae2bcad907cf7ee38584855bafe4979a"}, {"name": "3.0.22 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/a0c8ec557d9cac078f032d76cdf684fe743eb382"}], "source": {"discovery": "UNKNOWN"}, "title": "Heap Buffer Overflow in CMS Key Unwrapping", "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": "2026-08-25T14:29:50.344129Z", "id": "CVE-2026-63072", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"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": "2026-08-25T14:29:55.378Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "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": {"id": "CVE-2026-63072", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-25T14:29:50.344129Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-25T14:29:44.760Z"}}], "cna": {"title": "Heap Buffer Overflow in CMS Key Unwrapping", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "reporter", "value": "Bhabani Sankar Das"}, {"lang": "en", "type": "reporter", "value": "Filipe Casal(Trail of Bits)"}, {"lang": "en", "type": "remediation developer", "value": "Daniel Kubec"}], "metrics": [{"other": {"type": "https://openssl-library.org/policies/general/security-policy/", "content": {"text": "Moderate"}}, "format": "other"}], "affected": [{"vendor": "OpenSSL", "product": "OpenSSL", "versions": [{"status": "affected", "version": "4.0.0", "lessThan": "4.0.2", "versionType": "semver"}, {"status": "affected", "version": "3.6.0", "lessThan": "3.6.4", "versionType": "semver"}, {"status": "affected", "version": "3.5.0", "lessThan": "3.5.8", "versionType": "semver"}, {"status": "affected", "version": "3.4.0", "lessThan": "3.4.7", "versionType": "semver"}, {"status": "affected", "version": "3.0.0", "lessThan": "3.0.22", "versionType": "semver"}, {"status": "affected", "version": "1.1.1", "lessThan": "1.1.1zi", "versionType": "custom"}], "defaultStatus": "unaffected"}], "datePublic": "2026-08-25T11:36:16.000Z", "references": [{"url": "https://openssl-library.org/news/secadv/20260825.txt", "name": "OpenSSL Advisory", "tags": ["vendor-advisory"]}, {"url": "https://github.com/openssl/openssl/commit/9530a5fd1aacaeccdced4478ea2340a480613335", "name": "4.0.2 git commit", "tags": ["patch"]}, {"url": "https://github.com/openssl/openssl/commit/2a3dac874c8057c1f0186849bf1ede1ae7b6b756", "name": "3.6.4 git commit", "tags": ["patch"]}, {"url": "https://github.com/openssl/openssl/commit/87784ad619af36b8807c2044b3940006fccc1e42", "name": "3.5.8 git commit", "tags": ["patch"]}, {"url": "https://github.com/openssl/openssl/commit/9ec2f6d2ae2bcad907cf7ee38584855bafe4979a", "name": "3.4.7 git commit", "tags": ["patch"]}, {"url": "https://github.com/openssl/openssl/commit/a0c8ec557d9cac078f032d76cdf684fe743eb382", "name": "3.0.22 git commit", "tags": ["patch"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based\non querying the unwrapped key size, but the AES-WRAP-PAD unwrap primitive\ncan write and cleanse more bytes than that query reports, causing an 8-byte\nout-of-bounds heap write.\n\nImpact summary: An attacker who supplies a crafted CMS message can trigger a\ndeterministic 8-byte out-of-bounds heap write when the victim decrypts it\nwith CMS_decrypt(), corrupting the heap and typically resulting in a Denial\nof Service.\n\nCWE: CWE-787: Out-of-bounds Write\n\nDescription: The key-wrap OID is potentially attacker-controlled on the wire.\nCMS unwrapping allows both id-aesNNN-wrap-pad and id-aesNNN-wrap ciphers.\nAn attacker can take a legitimate message and change a single OID byte to\nselect the padded variant while leaving the message otherwise valid. Since\nthe unwrap key is derived from the recipient's private operation (ECDH key\nagreement or ML-KEM decapsulation), the RFC 5649 integrity check cannot\npass, and the decryption fails with integrity failure.\n\nThe write is a fixed-size (8-byte), fixed-value (zero) heap overflow\nimmediately past the allocation, requires no special configuration, and is\nreachable from the public CMS_decrypt() function. The consequence is\na heap corruption leading to a Denial of Service. The fix in the CMS code\nsizes the unwrap output buffer for the worst case so a failed unwrap cannot\nwrite past the allocation.\n\nFIPS impact: no\n\nAs the CMS code lives outside the FIPS module boundary, no FIPS\nmodules are affected by this CVE.", "supportingMedia": [{"type": "text/html", "value": "Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based<br>on querying the unwrapped key size, but the AES-WRAP-PAD unwrap primitive<br>can write and cleanse more bytes than that query reports, causing an 8-byte<br>out-of-bounds heap write.<br><br>Impact summary: An attacker who supplies a crafted CMS message can trigger a<br>deterministic 8-byte out-of-bounds heap write when the victim decrypts it<br>with CMS_decrypt(), corrupting the heap and typically resulting in a Denial<br>of Service.<br><br>CWE: CWE-787: Out-of-bounds Write<br><br>Description: The key-wrap OID is potentially attacker-controlled on the wire.<br>CMS unwrapping allows both id-aesNNN-wrap-pad and id-aesNNN-wrap ciphers.<br>An attacker can take a legitimate message and change a single OID byte to<br>select the padded variant while leaving the message otherwise valid. Since<br>the unwrap key is derived from the recipient's private operation (ECDH key<br>agreement or ML-KEM decapsulation), the RFC 5649 integrity check cannot<br>pass, and the decryption fails with integrity failure.<br><br>The write is a fixed-size (8-byte), fixed-value (zero) heap overflow<br>immediately past the allocation, requires no special configuration, and is<br>reachable from the public CMS_decrypt() function. The consequence is<br>a heap corruption leading to a Denial of Service. The fix in the CMS code<br>sizes the unwrap output buffer for the worst case so a failed unwrap cannot<br>write past the allocation.<br><br>FIPS impact: no<br><br>As the CMS code lives outside the FIPS module boundary, no FIPS<br>modules are affected by this CVE.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-08-25T12:59:34.428Z"}}}, "cveMetadata": {"cveId": "CVE-2026-63072", "state": "PUBLISHED", "dateUpdated": "2026-08-25T14:29:55.378Z", "dateReserved": "2026-07-15T13:10:26.188Z", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "datePublished": "2026-08-25T12:59:34.428Z", "assignerShortName": "openssl"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.2", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.4", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.8", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.7", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.0.22", "status": "affected", "version": "3.0.0", "versionType": "semver"}, {"lessThan": "1.1.1zi", "status": "affected", "version": "1.1.1", "versionType": "custom"}]}], "source": "openssl-security@openssl.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based\non querying the unwrapped key size, but the AES-WRAP-PAD unwrap primitive\ncan write and cleanse more bytes than that query reports, causing an 8-byte\nout-of-bounds heap write.\n\nImpact summary: An attacker who supplies a crafted CMS message can trigger a\ndeterministic 8-byte out-of-bounds heap write when the victim decrypts it\nwith CMS_decrypt(), corrupting the heap and typically resulting in a Denial\nof Service.\n\nCWE: CWE-787: Out-of-bounds Write\n\nDescription: The key-wrap OID is potentially attacker-controlled on the wire.\nCMS unwrapping allows both id-aesNNN-wrap-pad and id-aesNNN-wrap ciphers.\nAn attacker can take a legitimate message and change a single OID byte to\nselect the padded variant while leaving the message otherwise valid. Since\nthe unwrap key is derived from the recipient's private operation (ECDH key\nagreement or ML-KEM decapsulation), the RFC 5649 integrity check cannot\npass, and the decryption fails with integrity failure.\n\nThe write is a fixed-size (8-byte), fixed-value (zero) heap overflow\nimmediately past the allocation, requires no special configuration, and is\nreachable from the public CMS_decrypt() function. The consequence is\na heap corruption leading to a Denial of Service. The fix in the CMS code\nsizes the unwrap output buffer for the worst case so a failed unwrap cannot\nwrite past the allocation.\n\nFIPS impact: no\n\nAs the CMS code lives outside the FIPS module boundary, no FIPS\nmodules are affected by this CVE."}], "id": "CVE-2026-63072", "lastModified": "2026-08-25T15:16:36.060", "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-2026-63072", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-25T14:29:50.344129Z", "version": "2.0.3"}}]}, "published": "2026-08-25T13:19:26.010", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/2a3dac874c8057c1f0186849bf1ede1ae7b6b756"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/87784ad619af36b8807c2044b3940006fccc1e42"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/9530a5fd1aacaeccdced4478ea2340a480613335"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/9ec2f6d2ae2bcad907cf7ee38584855bafe4979a"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/a0c8ec557d9cac078f032d76cdf684fe743eb382"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260825.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{}

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