{"api_version":"1","generated_at":"2026-09-13T15:19:09+00:00","cve":"CVE-2026-63072","urls":{"html":"https://cve.report/CVE-2026-63072","api":"https://cve.report/api/cve/CVE-2026-63072.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63072","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63072"},"summary":{"title":"Heap Buffer Overflow in CMS Key Unwrapping","description":"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.","state":"PUBLISHED","assigner":"openssl","published_at":"2026-08-25 13:19:26","updated_at":"2026-09-11 21:16:34"},"problem_types":["CWE-787","CWE-787 CWE-787 Out-of-bounds 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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. 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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. 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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.","Type":"Description","Title":"Heap Buffer Overflow in CMS Key Unwrapping"}]}}}