CVE-2026-54872Low· 3.7▾ SunlitIssue summary: The generic elliptic-curve scalar multiplication used for ECDSA and SM2 signature operations with curves that do not have a dedicated implementation leaks information about the secret nonce through timing. Impact summary:…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 20.4 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 30.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
— → 3.7
none → low
0.3%
Last analysed / modified upstream
0.3% → 0.4%
Issue summary: The generic elliptic-curve scalar multiplication used for ECDSA and SM2 signature operations with curves that do not have a dedicated implementation leaks information about the secret nonce through timing.
Impact summary: An attacker able to measure 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: The generic elliptic-curve scalar multiplication used for curves that do not have a dedicated constant-time implementation pads the secret scalar with non-constant-time BIGNUM operations, so the time taken depends on the value of the secret scalar derived from the ECDSA and SM2 nonce.
The leak is very small; observing it requires a large number of measurements. The effect is largest for curves whose group order lies on a machine-word boundary, such as brainpoolP384r1.
Applications using ECDSA signing over the Brainpool and other generic prime curves, and SM2 signing on platforms that use the generic implementation, are vulnerable to this issue.
The NIST curves P-256, P-384 and P-521 use dedicated constant-time implementations and are not affected.
FIPS Impact: no The FIPS modules are not affected: the approved NIST curves used in the FIPS provider have dedicated constant-time implementations and do not use the affected code path.
openssl >= 1.0.2, < 1.0.2zsopenssl >= 1.1.1, < 1.1.1zjopenssl >= 3.0.0, < 3.0.23openssl >= 3.4.0, < 3.4.8openssl >= 3.5.0, < 3.5.9openssl >= 3.6.0, < 3.6.5openssl >= 4.0.0, < 4.0.3Upgrade past the affected range:
openssl 4.0.3Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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