{"schema_version":"1","data":[{"id":3834,"advisory_id":"d8a1e761-7999-460e-91f1-ddc2598bf47b","revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-77696","source_published_at":"2026-09-29T15:32:22.52+00:00","published_at":"2026-10-24T21:41:13.588934+00:00","extraction_method":"structured","technologies":["core-cve","openssl"],"cve_ids":["CVE-2026-77696"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"Timing Side-Channel in SM2 Signature Generation","summary":"Issue summary: SM2 signature generation uses non-constant-time arithmetic on secret values, forming a timing side-channel. Impact summary: An attacker able to measure SM2 signing times may learn information about the per-signature secret nonce, which over many signatures can, via a lattice / Hidden Number Problem attack, lead to recovery of the private key. CWE: CWE-208: Observable Timing Discrepancy Description: SM2 signature generation computes the signature value using variable-time BIGNUM operations on the secret nonce and the private key, so the time taken to produce an SM2 signature depends on these secret values, forming a timing side-channel. Applications performing SM2 signature generation are affected on all platforms. FIPS Impact: no SM2 is not a FIPS algorithm.","evidence":"cve:CVE-2026-77696","products":[{"name":{"value":"OpenSSL","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"unknown","structured":{"id":"CVE-2026-77696","aliases":["CVE-2026-77696"],"metrics":[{"other":{"type":"https://openssl-library.org/policies/general/security-policy/","content":{"text":"Low"}},"format":"other"}],"affected":[{"vendor":"OpenSSL","product":"OpenSSL","versions":[{"status":"affected","version":"4.0.0","lessThan":"4.0.3","versionType":"semver"},{"status":"affected","version":"3.6.0","lessThan":"3.6.5","versionType":"semver"},{"status":"affected","version":"3.5.0","lessThan":"3.5.9","versionType":"semver"},{"status":"affected","version":"3.4.0","lessThan":"3.4.8","versionType":"semver"},{"status":"affected","version":"3.0.0","lessThan":"3.0.23","versionType":"semver"},{"status":"affected","version":"1.1.1","lessThan":"1.1.1zj","versionType":"custom"}],"defaultStatus":"unaffected"}],"modified":"2026-09-29T16:51:33.618Z","provider":"cve","references":["https://openssl-library.org/news/secadv/20260929.txt","https://github.com/openssl/openssl/commit/20b20628d39b2dcc4677194bd68c7c060fa598cb","https://github.com/openssl/openssl/commit/1c4aed808a7aea32d2d013049c2e0d9fef164fc9","https://github.com/openssl/openssl/commit/6b90445a56b99a328ac1feba058abf976504f440","https://github.com/openssl/openssl/commit/419f5cb519721dceed393dbc524d79e487c72e64"],"provider_metadata":{"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":"2026-09-29T16:51:33.618Z"}}],"cna":{"orgId":"3a12439a-ef3a-4c79-92e6-6081a721f1e5","shortName":"openssl","dateUpdated":"2026-09-29T15:32:22.520Z"}}},"related_cves":[{"value":"CVE-2026-77696","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":null},"priority":{"reasons":[],"severity":"unknown","linked_cves":[],"fix_available":false,"known_exploited":false,"publisher_severity":"unknown"},"context_update":false}],"next_after":3834,"next_before":3834}