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[ CVE-2026-77696 · Published 29 Sep 2026 ]

Vulnerability in OpenSSL

CVSS 3.7 EPSS <1%2 agency advisoriesFix available

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

[ Advisories ]Government CERT advisories

  • CERT-FRCERTFR-2026-AVI-1241

    Multiple vulnerabilities in OpenSSL Translated from French

    Multiple vulnerabilities have been discovered in OpenSSL. Some of them allow an attacker to cause remote denial of service, a breach of data confidentiality and a breach of data integrity.

    CVE-2026-75806CVE-2026-77696CVE-2026-35189+11 more CVEs
  • BSI CERT-BundWID-SEC-2026-3638

    OpenSSL: Multiple vulnerabilities Translated from German

    Risk highCVE-2026-35189CVE-2026-84784CVE-2026-75805+11 more CVEs

[ References ]References