{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-28388", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-02-27T13:45:02.161Z", "datePublished": "2026-04-07T22:00:52.382Z", "dateUpdated": "2026-04-07T22:00:52.382Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "3.6.2", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.6", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.5", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.3.7", "status": "affected", "version": "3.3.0", "versionType": "semver"}, {"lessThan": "3.0.20", "status": "affected", "version": "3.0.0", "versionType": "semver"}, {"lessThan": "1.1.1zg", "status": "affected", "version": "1.1.1", "versionType": "custom"}, {"lessThan": "1.0.2zp", "status": "affected", "version": "1.0.2", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Igor Morgenstern (Aisle Research)"}, {"lang": "en", "type": "remediation developer", "value": "Igor Morgenstern (Aisle Research)"}], "datePublic": "2026-04-07T14:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: When a delta CRL that contains a Delta CRL Indicator extension<br>is processed a NULL pointer dereference might happen if the required CRL<br>Number extension is missing.<br><br>Impact summary: A NULL pointer dereference can trigger a crash which<br>leads to a Denial of Service for an application.<br><br>When CRL processing and delta CRL processing is enabled during X.509<br>certificate verification, the delta CRL processing does not check<br>whether the CRL Number extension is NULL before dereferencing it.<br>When a malformed delta CRL file is being processed, this parameter<br>can be NULL, causing a NULL pointer dereference.<br><br>Exploiting this issue requires the X509_V_FLAG_USE_DELTAS flag to be enabled in<br>the verification context, the certificate being verified to contain a<br>freshestCRL extension or the base CRL to have the EXFLAG_FRESHEST flag set, and<br>an attacker to provide a malformed CRL to an application that processes it.<br><br>The vulnerability is limited to Denial of Service and cannot be escalated to<br>achieve code execution or memory disclosure. For that reason the issue was<br>assessed as Low severity according to our Security Policy.<br><br>The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,<br>as the affected code is outside the OpenSSL FIPS module boundary."}], "value": "Issue summary: When a delta CRL that contains a Delta CRL Indicator extension\nis processed a NULL pointer dereference might happen if the required CRL\nNumber extension is missing.\n\nImpact summary: A NULL pointer dereference can trigger a crash which\nleads to a Denial of Service for an application.\n\nWhen CRL processing and delta CRL processing is enabled during X.509\ncertificate verification, the delta CRL processing does not check\nwhether the CRL Number extension is NULL before dereferencing it.\nWhen a malformed delta CRL file is being processed, this parameter\ncan be NULL, causing a NULL pointer dereference.\n\nExploiting this issue requires the X509_V_FLAG_USE_DELTAS flag to be enabled in\nthe verification context, the certificate being verified to contain a\nfreshestCRL extension or the base CRL to have the EXFLAG_FRESHEST flag set, and\nan attacker to provide a malformed CRL to an application that processes it.\n\nThe vulnerability is limited to Denial of Service and cannot be escalated to\nachieve code execution or memory disclosure. For that reason the issue was\nassessed as Low severity according to our Security Policy.\n\nThe FIPS modules in 3.6, 3.5, 3.4, 3.3 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-476", "description": "CWE-476 NULL Pointer Dereference", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-04-07T22:00:52.382Z"}, "references": [{"name": "OpenSSL Advisory", "tags": ["vendor-advisory"], "url": "https://openssl-library.org/news/secadv/20260407.txt"}, {"name": "3.6.2 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/602542f2c0c2d5edb47128f93eac10b62aeeefb3"}, {"name": "3.5.6 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/d3a901e8d9f021f3e67d6cfbc12e768129862726"}, {"name": "3.4.5 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/a9d187dd1000130100fa7ab915f8513532cb3bb8"}, {"name": "3.3.7 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/5a0b4930779cd2408880979db765db919da55139"}, {"name": "3.0.20 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/59c3b3158553ab53275bbbccca5cb305d591cf2e"}], "source": {"discovery": "UNKNOWN"}, "title": "NULL Pointer Dereference When Processing a Delta CRL", "x_generator": {"engine": "Vulnogram 0.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Issue summary: When a delta CRL that contains a Delta CRL Indicator extension\nis processed a NULL pointer dereference might happen if the required CRL\nNumber extension is missing.\n\nImpact summary: A NULL pointer dereference can trigger a crash which\nleads to a Denial of Service for an application.\n\nWhen CRL processing and delta CRL processing is enabled during X.509\ncertificate verification, the delta CRL processing does not check\nwhether the CRL Number extension is NULL before dereferencing it.\nWhen a malformed delta CRL file is being processed, this parameter\ncan be NULL, causing a NULL pointer dereference.\n\nExploiting this issue requires the X509_V_FLAG_USE_DELTAS flag to be enabled in\nthe verification context, the certificate being verified to contain a\nfreshestCRL extension or the base CRL to have the EXFLAG_FRESHEST flag set, and\nan attacker to provide a malformed CRL to an application that processes it.\n\nThe vulnerability is limited to Denial of Service and cannot be escalated to\nachieve code execution or memory disclosure. For that reason the issue was\nassessed as Low severity according to our Security Policy.\n\nThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,\nas the affected code is outside the OpenSSL FIPS module boundary."}], "id": "CVE-2026-28388", "lastModified": "2026-04-07T22:16:20.863", "metrics": {}, "published": "2026-04-07T22:16:20.863", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/59c3b3158553ab53275bbbccca5cb305d591cf2e"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/5a0b4930779cd2408880979db765db919da55139"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/602542f2c0c2d5edb47128f93eac10b62aeeefb3"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/a9d187dd1000130100fa7ab915f8513532cb3bb8"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/d3a901e8d9f021f3e67d6cfbc12e768129862726"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260407.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{}

{}