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Servers and applications

CVE-2026-77696

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…

Severity
Low 3.7
Published
29 Sept 2026
Last changed
8 Oct 2026
Added to UpHeron
21 Oct 2026
Fixed in
1.1.1zj, 3.0.23, 3.4.8, 3.5.9, 3.6.5, 4.0.3
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSLServers and applications · cpe:a:openssl:openssl
  • From 1.1.1 before 1.1.1zj
  • From 3.0.0 before 3.0.23
  • From 3.4.0 before 3.4.8
  • From 3.5.0 before 3.5.9
  • From 3.6.0 before 3.6.5
  • From 4.0.0 before 4.0.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-77696
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-77696