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Vulnerabilities

Vulnerability · CVE-2026-77696

Issue summary: SM2 signature generation uses non-constant-time arithmetic on secret values, forming a timing side-channel.

Published Sep 29, 2026 · catalog updated Oct 26, 2026 · Issue summary: SM2 signature

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-77696. EPSS is 0.40%. Act only if a listed version of Issue summary: SM2 signature is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Issue summary: SM2 signature).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low3.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.40%
Remediation
Advisory link
Affected products
Debian:12 openssl · Debian:13 openssl · Debian:14 openssl

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 openssl0 → 3.0.22-1~deb12u2
  • Debian:13 openssl0 → 3.5.7-1~deb13u3
  • Debian:14 openssl0 → 3.6.5-1

How to fix CVE-2026-77696

  • Upgrade

    CVE-2026-77696 lists a fix boundary at 3.0.22-1~deb12u2. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 3.0.22-1~deb12u2 · 2 other ranges on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-77696. EPSS is 0.40%. Act only if a listed version of Issue summary: SM2 signature is installed.

Which versions are affected?

Compare what you have installed with 0 → 3.0.22-1~deb12u2, 0 → 3.5.7-1~deb13u3, 0 → 3.6.5-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.40%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 29, 2026 · Trivy Vulnerability DB

    Detected

    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 Discrepa

  2. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.0.22-1~deb12u2; openssl fixed in 3.5.7-1~deb13u3; openssl fixed in 3.6.5-1

  3. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.0.22-1~deb12u2

  4. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.5.7-1~deb13u3

  5. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.6.5-1

  6. Oct 26, 2026 · Trivy Vulnerability DB

    Updated

    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 Discrepa

Sources

  • CVE.orgVulnerability recordCVE-2026-77696

    Official CVE identifier

    cve.org
  • Trivy Vulnerability DBPackage advisoryDEBIAN-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

    osv.dev

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 26, 2026
  • Trivy Vulnerability DBOct 26, 2026