{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77696", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-08-21T07:47:36.032Z", "datePublished": "2026-09-29T15:32:22.520Z", "dateUpdated": "2026-09-29T16:51:33.618Z"}, "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"}, {"lessThan": "1.1.1zj", "status": "affected", "version": "1.1.1", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Vladimir Tokarev"}, {"lang": "en", "type": "remediation developer", "value": "Igor Ustinov"}, {"lang": "en", "type": "remediation developer", "value": "Viktor Dukhovni"}], "datePublic": "2026-09-29T14:21:57.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: SM2 signature generation uses non-constant-time arithmetic<br>on secret values, forming a timing side-channel.<br><br>Impact summary: An attacker able to measure SM2 signing times may learn<br>information about the per-signature secret nonce, which over many signatures<br>can, via a lattice / Hidden Number Problem attack, lead to recovery of the<br>private key.<br><br>CWE: CWE-208: Observable Timing Discrepancy<br><br>Description: SM2 signature generation computes the signature value using<br>variable-time BIGNUM operations on the secret nonce and the private key, so<br>the time taken to produce an SM2 signature depends on these secret values,<br>forming a timing side-channel.<br><br>Applications performing SM2 signature generation are affected on all<br>platforms.<br><br>FIPS Impact: no<br>SM2 is not a FIPS algorithm."}], "value": "Issue summary: SM2 signature generation uses non-constant-time arithmetic\non secret values, forming a timing side-channel.\n\nImpact summary: An attacker able to measure SM2 signing times may learn\ninformation about the per-signature secret nonce, which over many signatures\ncan, via a lattice / Hidden Number Problem attack, lead to recovery of the\nprivate key.\n\nCWE: CWE-208: Observable Timing Discrepancy\n\nDescription: SM2 signature generation computes the signature value using\nvariable-time BIGNUM operations on the secret nonce and the private key, so\nthe time taken to produce an SM2 signature depends on these secret values,\nforming a timing side-channel.\n\nApplications performing SM2 signature generation are affected on all\nplatforms.\n\nFIPS Impact: no\nSM2 is not a FIPS algorithm."}], "metrics": [{"format": "other", "other": {"content": {"text": "Low"}, "type": "https://openssl-library.org/policies/general/security-policy/"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-208", "description": "CWE-208 Observable Timing Discrepancy", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-09-29T15:32:22.520Z"}, "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/20b20628d39b2dcc4677194bd68c7c060fa598cb"}, {"name": "3.6.5 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/1c4aed808a7aea32d2d013049c2e0d9fef164fc9"}, {"name": "3.5.9 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/6b90445a56b99a328ac1feba058abf976504f440"}, {"name": "3.4.8 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/419f5cb519721dceed393dbc524d79e487c72e64"}], "source": {"discovery": "UNKNOWN"}, "title": "Timing Side-Channel in SM2 Signature Generation", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-09-29T16:51:30.070097Z", "id": "CVE-2026-77696", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-29T16:51:33.618Z"}}]}}

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"custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Vladimir Tokarev"}, {"lang": "en", "type": "remediation developer", "value": "Igor Ustinov"}, {"lang": "en", "type": "remediation developer", "value": "Viktor Dukhovni"}], "datePublic": "2026-09-29T14:21:57.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: SM2 signature generation uses non-constant-time arithmetic<br>on secret values, forming a timing side-channel.<br><br>Impact summary: An attacker able to measure SM2 signing times may learn<br>information about the per-signature secret nonce, which over many signatures<br>can, via a lattice / Hidden Number Problem attack, lead to recovery of the<br>private key.<br><br>CWE: CWE-208: Observable Timing Discrepancy<br><br>Description: SM2 signature generation computes the signature value using<br>variable-time BIGNUM operations on the secret nonce and the private key, so<br>the time taken to produce an SM2 signature depends on these secret values,<br>forming a timing side-channel.<br><br>Applications performing SM2 signature generation are affected on all<br>platforms.<br><br>FIPS Impact: no<br>SM2 is not a FIPS algorithm."}], "value": "Issue summary: SM2 signature generation uses non-constant-time arithmetic\non secret values, forming a timing side-channel.\n\nImpact summary: An attacker able to measure SM2 signing times may learn\ninformation about the per-signature secret nonce, which over many signatures\ncan, via a lattice / Hidden Number Problem attack, lead to recovery of the\nprivate key.\n\nCWE: CWE-208: Observable Timing Discrepancy\n\nDescription: SM2 signature generation computes the signature value using\nvariable-time BIGNUM operations on the secret nonce and the private key, so\nthe time taken to produce an SM2 signature depends on these secret values,\nforming a timing side-channel.\n\nApplications performing SM2 signature generation are affected on 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"https://github.com/openssl/openssl/commit/6b90445a56b99a328ac1feba058abf976504f440"}, {"name": "3.4.8 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/419f5cb519721dceed393dbc524d79e487c72e64"}], "source": {"discovery": "UNKNOWN"}, "title": "Timing Side-Channel in SM2 Signature Generation", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-77696", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-29T16:51:30.070097Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-29T16:51:26.361Z"}}]}}

{"affected": [{"affectedData": [{"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"}, {"lessThan": "1.1.1zj", "status": "affected", "version": "1.1.1", "versionType": "custom"}]}], "source": "openssl-security@openssl.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Issue summary: SM2 signature generation uses non-constant-time arithmetic\non secret values, forming a timing side-channel.\n\nImpact summary: An attacker able to measure SM2 signing times may learn\ninformation about the per-signature secret nonce, which over many signatures\ncan, via a lattice / Hidden Number Problem attack, lead to recovery of the\nprivate key.\n\nCWE: CWE-208: Observable Timing Discrepancy\n\nDescription: SM2 signature generation computes the signature value using\nvariable-time BIGNUM operations on the secret nonce and the private key, so\nthe time taken to produce an SM2 signature depends on these secret values,\nforming a timing side-channel.\n\nApplications performing SM2 signature generation are affected on all\nplatforms.\n\nFIPS Impact: no\nSM2 is not a FIPS algorithm."}], "id": "CVE-2026-77696", "lastModified": "2026-09-29T17:17:10.343", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77696", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-29T16:51:30.070097Z", "version": "2.0.3"}}]}, "published": "2026-09-29T16:17:11.493", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/1c4aed808a7aea32d2d013049c2e0d9fef164fc9"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/20b20628d39b2dcc4677194bd68c7c060fa598cb"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/419f5cb519721dceed393dbc524d79e487c72e64"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/6b90445a56b99a328ac1feba058abf976504f440"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260929.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-208"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.0.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.6.0,3.6.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.5.0,3.5.9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.4.0,3.4.8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.0,3.0.23)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.1.1,1.1.1zj)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "OpenSSL", "source": "cna", "vendor": "OpenSSL"}, "product": "openssl", "vendor": "openssl"}], "created": "2026-09-29T17:30:17.062272+00:00", "updated": "2026-09-29T17:30:17.062297+00:00", "vendors": ["openssl", "openssl$PRODUCT$openssl"]}