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CVE-2026-77696

low CVSS 3.7 EPSS 0.2%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-77696 applies to, and the release that fixes it where the sources name one.

openssl 1.1.1u fixed in 4.0.3

At a glance

Severity
Low
CVSS base score
3.7 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.2% probability of exploitation in the next 30 days, higher than 14% of scored vulnerabilities
Weakness
CWE-208
Published
2026-09-29
NVD CVE.org

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