{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-75805", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-08-18T09:34:32.659Z", "datePublished": "2026-09-29T15:32:20.408Z", "dateUpdated": "2026-09-29T15:32:20.408Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.3", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.5", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.9", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.8", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.0.23", "status": "affected", "version": "3.0.0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Bhabani Sankar Das"}, {"lang": "en", "type": "remediation developer", "value": "Bhabani Sankar Das"}, {"lang": "en", "type": "remediation developer", "value": "Norbert Pocs"}], "datePublic": "2026-09-29T14:21:57.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: A CMP client that requests certificate revocation on the basis<br>of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when<br>processing a crafted revocation response. <br><br>Impact summary: The NULL pointer dereference happens on a read which <br>leads to a crash and a Denial of Service for the affected client application.<br><br>CWE: CWE-476: NULL-pointer dereference<br><br>Description: A CMP client revoking a certificate has to tell the server which<br>certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the<br>certificate itself or its issuer name and serial number. This is<br>'openssl cmp -cmd rr -csr <file>' on the command line, or<br>OSSL_CMP_exec_RR_ses() with the certificate supplied via<br>OSSL_CMP_CTX_set1_p10CSR() through the API.<br><br>A CSR does not contain the issuer name and serial number of the certificate,<br>so the client does not send them. A server may optionally name the<br>certificate it revoked in its response, and the client then compares that<br>name against what it sent. Having sent neither an issuer name nor a serial<br>number, it has nothing to compare against, and a server returning a specially<br>crafted name causes the client to read from a NULL pointer and crash.<br><br>The revocation response is checked for valid message protection before<br>the affected code is reached, so an attacker must be a malicious or<br>compromised CMP server, or a man-in-the-middle in possession of the<br>secret used for message protection. Clients that identify the certificate<br>to be revoked by a certificate or by issuer and serial number rather<br>than by a PKCS#10 CSR are not affected.<br><br>FIPS impact: no<br>No FIPS modules are affected by this issue, as the CMP protocol<br>implementation is outside the OpenSSL FIPS module boundary."}], "value": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n'openssl cmp -cmd rr -csr <file>' on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation 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-476", "description": "CWE-476 NULL-pointer dereference", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-09-29T15:32:20.408Z"}, "references": [{"name": "OpenSSL Advisory", "tags": ["vendor-advisory"], "url": "https://openssl-library.org/news/secadv/20260929.txt"}, {"name": "4.0.3 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"}, {"name": "3.6.5 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"}, {"name": "3.5.9 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"}, {"name": "3.4.8 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"}], "source": {"discovery": "UNKNOWN"}, "title": "NULL Pointer Dereference in CMP Client Revocation Response Handling", "x_generator": {"engine": "Vulnogram 0.2.0"}}}}

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