{"api_version":"1","generated_at":"2026-09-13T06:24:43+00:00","cve":"CVE-2026-63076","urls":{"html":"https://cve.report/CVE-2026-63076","api":"https://cve.report/api/cve/CVE-2026-63076.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63076","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63076"},"summary":{"title":"Invalid Pointer Dereference in CMP Server via Crafted protectionAlg","description":"Issue summary: OpenSSL CMP password based protection verification only\nchecks whether the protectionAlg parameter was not NULL and not its\nASN.1 type, before treating it as a PBMParameter. A crafted message can\ncontain a parameter of a different type, which is then dereferenced as an\ninvalid pointer.\n\nImpact summary: A remote, unauthenticated attacker can crash an application\nacting as a CMP server that accepts PBM-protected messages, or a CMP client\ntalking to a malicious or intercepted CMP server, resulting in a Denial of\nService.\n\nCWE: CWE-476: NULL Pointer Dereference\n\nDescription: When verifying the password-based MAC protection of a CMP\nmessage, OpenSSL library reads the protectionAlg algorithm parameter with\nX509_ALGOR_get0(), which returns both the parameter type and its value\npointer. The value is then cast to an ASN1_STRING and treated as the\nexpected PBMParameter after only checking that pointer is not NULL. The\nparameter type returned by X509_ALGOR_get0() was never consulted.\n\nThis happens during protection verification, before any MAC is computed, so\nno knowledge of the PBM shared secret is required; the only precondition is\nthat PBM verification is reachable. On the server side this is reached from\nOSSL_CMP_SRV_process_request() for any application that stands up a CMP\nserver accepting PBM-protected messages, and on the client side from CMP\nresponse validation against a malicious or on-path (MITM) server. The\nreliable consequence is a denial of service; there is no memory disclosure,\nno controlled memory write, and no path to code execution. CMP is a\nspecialized feature that an application must explicitly enable.\n\nFIPS impact: no\nAs the CMP code lives outside the FIPS module boundary, no FIPS modules\nare affected by this CVE.","state":"PUBLISHED","assigner":"openssl","published_at":"2026-08-25 13:19:26","updated_at":"2026-09-11 21:17:12"},"problem_types":["CWE-476","CWE-476 CWE-476 NULL Pointer 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Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/openssl/openssl/commit/37882aa2e0256e1072442a8f62f7db45b995c45b","name":"https://github.com/openssl/openssl/commit/37882aa2e0256e1072442a8f62f7db45b995c45b","refsource":"openssl-security@openssl.org","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/openssl/openssl/commit/cdacfff557389abfa9e4615abded2ec984517d6c","name":"https://github.com/openssl/openssl/commit/cdacfff557389abfa9e4615abded2ec984517d6c","refsource":"openssl-security@openssl.org","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/openssl/openssl/commit/a7af46a92d0ce19a90e669ef56d2576a07924226","name":"https://github.com/openssl/openssl/commit/a7af46a92d0ce19a90e669ef56d2576a07924226","refsource":"openssl-security@openssl.org","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/openssl/openssl/commit/a17cc8d612ecff6d94a9b7ca8b5283ddf5ff570e","name":"https://github.com/openssl/openssl/commit/a17cc8d612ecff6d94a9b7ca8b5283ddf5ff570e","refsource":"openssl-security@openssl.org","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/openssl/openssl/commit/a1f348ccb328c3afbd4ba6883f9b7c813c043259","name":"https://github.com/openssl/openssl/commit/a1f348ccb328c3afbd4ba6883f9b7c813c043259","refsource":"openssl-security@openssl.org","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63076","name":"CVE 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Kubec","lang":"en"}],"nvd_cpes":[{"cve_year":"2026","cve_id":"63076","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"openssl","cpe5":"openssl","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63076","cve":"CVE-2026-63076","epss":"0.013300000","percentile":"0.690430000","score_date":"2026-08-30","updated_at":"2026-08-31 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its<br>ASN.1 type, before treating it as a PBMParameter. A crafted message can<br>contain a parameter of a different type, which is then dereferenced as an<br>invalid pointer.<br><br>Impact summary: A remote, unauthenticated attacker can crash an application<br>acting as a CMP server that accepts PBM-protected messages, or a CMP client<br>talking to a malicious or intercepted CMP server, resulting in a Denial of<br>Service.<br><br>CWE: CWE-476: NULL Pointer Dereference<br><br>Description: When verifying the password-based MAC protection of a CMP<br>message, OpenSSL library reads the protectionAlg algorithm parameter with<br>X509_ALGOR_get0(), which returns both the parameter type and its value<br>pointer. The value is then cast to an ASN1_STRING and treated as the<br>expected PBMParameter after only checking that pointer is not NULL. The<br>parameter type returned by X509_ALGOR_get0() was never consulted.<br><br>This happens during protection verification, before any MAC is computed, so<br>no knowledge of the PBM shared secret is required; the only precondition is<br>that PBM verification is reachable. On the server side this is reached from<br>OSSL_CMP_SRV_process_request() for any application that stands up a CMP<br>server accepting PBM-protected messages, and on the client side from CMP<br>response validation against a malicious or on-path (MITM) server. The<br>reliable consequence is a denial of service; there is no memory disclosure,<br>no controlled memory write, and no path to code execution. CMP is a<br>specialized feature that an application must explicitly enable.<br><br>FIPS impact: no<br>As the CMP code lives outside the FIPS module boundary, no FIPS modules<br>are affected by this CVE."}],"value":"Issue summary: OpenSSL CMP password based protection verification only\nchecks whether the protectionAlg parameter was not NULL and not its\nASN.1 type, before treating it as a PBMParameter. A crafted message can\ncontain a parameter of a different type, which is then dereferenced as an\ninvalid pointer.\n\nImpact summary: A remote, unauthenticated attacker can crash an application\nacting as a CMP server that accepts PBM-protected messages, or a CMP client\ntalking to a malicious or intercepted CMP server, resulting in a Denial of\nService.\n\nCWE: CWE-476: NULL Pointer Dereference\n\nDescription: When verifying the password-based MAC protection of a CMP\nmessage, OpenSSL library reads the protectionAlg algorithm parameter with\nX509_ALGOR_get0(), which returns both the parameter type and its value\npointer. The value is then cast to an ASN1_STRING and treated as the\nexpected PBMParameter after only checking that pointer is not NULL. 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CMP is a\nspecialized feature that an application must explicitly enable.\n\nFIPS impact: no\nAs the CMP code lives outside the FIPS module boundary, no FIPS modules\nare affected by this CVE."}],"metrics":[{"format":"other","other":{"content":{"text":"Moderate"},"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":{"dateUpdated":"2026-08-25T13:00:11.218Z","orgId":"3a12439a-ef3a-4c79-92e6-6081a721f1e5","shortName":"openssl"},"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/a17cc8d612ecff6d94a9b7ca8b5283ddf5ff570e"},{"name":"3.6.4 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/a7af46a92d0ce19a90e669ef56d2576a07924226"},{"name":"3.5.8 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/cdacfff557389abfa9e4615abded2ec984517d6c"},{"name":"3.4.7 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/a1f348ccb328c3afbd4ba6883f9b7c813c043259"},{"name":"3.0.22 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/37882aa2e0256e1072442a8f62f7db45b995c45b"}],"source":{"discovery":"UNKNOWN"},"title":"Invalid Pointer Dereference in CMP Server via Crafted protectionAlg","x_generator":{"engine":"Vulnogram 0.2.0"}}},"cveMetadata":{"assignerOrgId":"3a12439a-ef3a-4c79-92e6-6081a721f1e5","assignerShortName":"openssl","cveId":"CVE-2026-63076","datePublished":"2026-08-25T13:00:11.218Z","dateReserved":"2026-07-15T13:10:26.188Z","dateUpdated":"2026-08-25T14:37:32.193Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-25 13:19:26","lastModifiedDate":"2026-09-11 21:17:12","problem_types":["CWE-476","CWE-476 CWE-476 NULL Pointer Dereference"],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-25T14:37:28.943884Z","id":"CVE-2026-63076","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*","versionStartIncluding":"3.0.0","versionEndExcluding":"3.0.22","matchCriteriaId":"5DAAFBD8-3DEE-4F6B-8D83-02966005168A"},{"vulnerable":true,"criteria":"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*","versionStartIncluding":"3.4.0","versionEndExcluding":"3.4.7","matchCriteriaId":"216D6529-561A-4684-A886-50954FBEBFB2"},{"vulnerable":true,"criteria":"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*","versionStartIncluding":"3.5.0","versionEndExcluding":"3.5.8","matchCriteriaId":"C5BB9E95-09B6-4163-B51C-D62B528A04DA"},{"vulnerable":true,"criteria":"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6.0","versionEndExcluding":"3.6.4","matchCriteriaId":"B1416826-F2F1-4EA8-9FB2-A56B0DA923C1"},{"vulnerable":true,"criteria":"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0.0","versionEndExcluding":"4.0.2","matchCriteriaId":"63B8F45B-E44F-481C-815D-AF9CA89C48F6"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63076","Ordinal":"1","Title":"Invalid Pointer Dereference in CMP Server via Crafted protection","CVE":"CVE-2026-63076","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63076","Ordinal":"1","NoteData":"Issue summary: OpenSSL CMP password based protection verification only\nchecks whether the protectionAlg parameter was not NULL and not its\nASN.1 type, before treating it as a PBMParameter. A crafted message can\ncontain a parameter of a different type, which is then dereferenced as an\ninvalid pointer.\n\nImpact summary: A remote, unauthenticated attacker can crash an application\nacting as a CMP server that accepts PBM-protected messages, or a CMP client\ntalking to a malicious or intercepted CMP server, resulting in a Denial of\nService.\n\nCWE: CWE-476: NULL Pointer Dereference\n\nDescription: When verifying the password-based MAC protection of a CMP\nmessage, OpenSSL library reads the protectionAlg algorithm parameter with\nX509_ALGOR_get0(), which returns both the parameter type and its value\npointer. The value is then cast to an ASN1_STRING and treated as the\nexpected PBMParameter after only checking that pointer is not NULL. The\nparameter type returned by X509_ALGOR_get0() was never consulted.\n\nThis happens during protection verification, before any MAC is computed, so\nno knowledge of the PBM shared secret is required; the only precondition is\nthat PBM verification is reachable. On the server side this is reached from\nOSSL_CMP_SRV_process_request() for any application that stands up a CMP\nserver accepting PBM-protected messages, and on the client side from CMP\nresponse validation against a malicious or on-path (MITM) server. The\nreliable consequence is a denial of service; there is no memory disclosure,\nno controlled memory write, and no path to code execution. CMP is a\nspecialized feature that an application must explicitly enable.\n\nFIPS impact: no\nAs the CMP code lives outside the FIPS module boundary, no FIPS modules\nare affected by this CVE.","Type":"Description","Title":"Invalid Pointer Dereference in CMP Server via Crafted protection"}]}}}