CVE-2026-77696: Timing Side-Channel in SM2 Signature Generation
Signature generation can expose sensitive information through timing.
CVE published 2026-09-29 · Record updated 2026-09-29 · Snapshot checked 24 October 2026
Why this matters
Signature generation can expose sensitive information through timing.
No CVSS score provided by the assigning authority in this snapshot.
A severity score describes the vulnerability, not the probability that your own website has been compromised. Exposure depends on the installed version, configuration and reachable code path.
When to check your system
Affected OpenSSL packages using SM2.
How to address it
Apply the matching vendor security update; assess which services use the vulnerable functionality.
Record the installed package and vendor build, check the advisory’s prerequisites, back up, apply the vendor fix and test the affected site functions. Distribution packages may include backported fixes without changing the upstream version number.
Sources
This page summarises a selected advisory. It is not evidence that a particular website is vulnerable. Where an advisory covers several CVEs, check the linked record for this CVE’s exact affected range.