{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-22796", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-01-09T18:54:13.571Z", "datePublished": "2026-01-27T16:01:28.150Z", "dateUpdated": "2026-01-27T16:28:52.046Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "3.6.1", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.5", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.4", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.3.6", "status": "affected", "version": "3.3.0", "versionType": "semver"}, {"lessThan": "3.0.19", "status": "affected", "version": "3.0.0", "versionType": "semver"}, {"lessThan": "1.1.1ze", "status": "affected", "version": "1.1.1", "versionType": "custom"}, {"lessThan": "1.0.2zn", "status": "affected", "version": "1.0.2", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Luigino Camastra (Aisle Research)"}, {"lang": "en", "type": "remediation developer", "value": "Bob Beck"}], "datePublic": "2026-01-27T14:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: A type confusion vulnerability exists in the signature<br>verification of signed PKCS#7 data where an ASN1_TYPE union member is<br>accessed without first validating the type, causing an invalid or NULL<br>pointer dereference when processing malformed PKCS#7 data.<br><br>Impact summary: An application performing signature verification of PKCS#7<br>data or calling directly the PKCS7_digest_from_attributes() function can be<br>caused to dereference an invalid or NULL pointer when reading, resulting in<br>a Denial of Service.<br><br>The function PKCS7_digest_from_attributes() accesses the message digest attribute<br>value without validating its type. When the type is not V_ASN1_OCTET_STRING,<br>this results in accessing invalid memory through the ASN1_TYPE union, causing<br>a crash.<br><br>Exploiting this vulnerability requires an attacker to provide a malformed<br>signed PKCS#7 to an application that verifies it. The impact of the<br>exploit is just a Denial of Service, the PKCS7 API is legacy and applications<br>should be using the CMS API instead. For these reasons the issue was<br>assessed as Low severity.<br><br>The FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,<br>as the PKCS#7 parsing implementation is outside the OpenSSL FIPS module<br>boundary.<br><br>OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue."}], "value": "Issue summary: A type confusion vulnerability exists in the signature\nverification of signed PKCS#7 data where an ASN1_TYPE union member is\naccessed without first validating the type, causing an invalid or NULL\npointer dereference when processing malformed PKCS#7 data.\n\nImpact summary: An application performing signature verification of PKCS#7\ndata or calling directly the PKCS7_digest_from_attributes() function can be\ncaused to dereference an invalid or NULL pointer when reading, resulting in\na Denial of Service.\n\nThe function PKCS7_digest_from_attributes() accesses the message digest attribute\nvalue without validating its type. When the type is not V_ASN1_OCTET_STRING,\nthis results in accessing invalid memory through the ASN1_TYPE union, causing\na crash.\n\nExploiting this vulnerability requires an attacker to provide a malformed\nsigned PKCS#7 to an application that verifies it. The impact of the\nexploit is just a Denial of Service, the PKCS7 API is legacy and applications\nshould be using the CMS API instead. 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When the type is not V_ASN1_OCTET_STRING,\nthis results in accessing invalid memory through the ASN1_TYPE union, causing\na crash.\n\nExploiting this vulnerability requires an attacker to provide a malformed\nsigned PKCS#7 to an application that verifies it. The impact of the\nexploit is just a Denial of Service, the PKCS7 API is legacy and applications\nshould be using the CMS API instead. For these reasons the issue was\nassessed as Low severity.\n\nThe FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,\nas the PKCS#7 parsing implementation is outside the OpenSSL FIPS module\nboundary.\n\nOpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.", "supportingMedia": [{"type": "text/html", "value": "Issue summary: A type confusion vulnerability exists in the signature<br>verification of signed PKCS#7 data where an ASN1_TYPE union member is<br>accessed without first validating the type, causing an invalid or NULL<br>pointer dereference when processing malformed PKCS#7 data.<br><br>Impact summary: An application performing signature verification of PKCS#7<br>data or calling directly the PKCS7_digest_from_attributes() function can be<br>caused to dereference an invalid or NULL pointer when reading, resulting in<br>a Denial of Service.<br><br>The function PKCS7_digest_from_attributes() accesses the message digest attribute<br>value without validating its type. When the type is not V_ASN1_OCTET_STRING,<br>this results in accessing invalid memory through the ASN1_TYPE union, causing<br>a crash.<br><br>Exploiting this vulnerability requires an attacker to provide a malformed<br>signed PKCS#7 to an application that verifies it. The impact of the<br>exploit is just a Denial of Service, the PKCS7 API is legacy and applications<br>should be using the CMS API instead. For these reasons the issue was<br>assessed as Low severity.<br><br>The FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,<br>as the PKCS#7 parsing implementation is outside the OpenSSL FIPS module<br>boundary.<br><br>OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-754", "description": "CWE-754 Improper Check for Unusual or Exceptional Conditions"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-01-27T16:01:28.150Z"}}}, "cveMetadata": {"cveId": "CVE-2026-22796", "state": "PUBLISHED", "dateUpdated": "2026-01-27T16:28:52.046Z", "dateReserved": "2026-01-09T18:54:13.571Z", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "datePublished": "2026-01-27T16:01:28.150Z", "assignerShortName": "openssl"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Issue summary: A type confusion vulnerability exists in the signature\nverification of signed PKCS#7 data where an ASN1_TYPE union member is\naccessed without first validating the type, causing an invalid or NULL\npointer dereference when processing malformed PKCS#7 data.\n\nImpact summary: An application performing signature verification of PKCS#7\ndata or calling directly the PKCS7_digest_from_attributes() function can be\ncaused to dereference an invalid or NULL pointer when reading, resulting in\na Denial of Service.\n\nThe function PKCS7_digest_from_attributes() accesses the message digest attribute\nvalue without validating its type. When the type is not V_ASN1_OCTET_STRING,\nthis results in accessing invalid memory through the ASN1_TYPE union, causing\na crash.\n\nExploiting this vulnerability requires an attacker to provide a malformed\nsigned PKCS#7 to an application that verifies it. The impact of the\nexploit is just a Denial of Service, the PKCS7 API is legacy and applications\nshould be using the CMS API instead. For these reasons the issue was\nassessed as Low severity.\n\nThe FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,\nas the PKCS#7 parsing implementation is outside the OpenSSL FIPS module\nboundary.\n\nOpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue."}], "id": "CVE-2026-22796", "lastModified": "2026-01-27T17:16:12.553", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-01-27T16:16:35.543", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/2502e7b7d4c0cf4f972a881641fe09edc67aeec4"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/572844beca95068394c916626a6d3a490f831a49"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/7bbca05be55b129651d9df4bdb92becc45002c12"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/eeee3cbd4d682095ed431052f00403004596373e"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/ef2fb66ec571564d64d1c74a12e388a2a54d05d2"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260127.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-754"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

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