Sm2 Elliptic Curve
CVE-2026-22698
HIGH
GHSA-w3g8-fp6j-wvqw
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
RustCrypto: Elliptic Curves is general purpose Elliptic Curve Cryptography (ECC) support, including types and traits for representing various elliptic curve forms, scalars, points, and public/secret keys composed thereof. In versions 0.14.0-pre.0 and 0.14.0-rc.0, a critical vulnerability exists in the SM2 Public Key Encryption (PKE) implementation where the ephemeral nonce k is generated with severely reduced entropy. A unit mismatch error causes the nonce generation function to request only 32 bits of randomness instead of the expected 256 bits. This reduces the security of the encryption from a 128-bit level to a trivial 16-bit level, allowing a practical attack to recover the nonce k and decrypt any ciphertext given only the public key and ciphertext. This issue has been patched via commit e4f7778.
AnalysisAI
SM2 elliptic curve implementations in RustCrypto versions 0.14.0-pre.0 and 0.14.0-rc.0 suffer from a critical entropy reduction flaw where ephemeral nonce generation requests only 32 bits instead of 256 bits of randomness, degrading encryption security from 128-bit to 16-bit strength. Public exploit code exists, allowing attackers to recover the nonce and decrypt ciphertexts using only the public key and encrypted message. …
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Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | RustCrypto Elliptic Curves versions 0.14.0-pre.0 or 0.14.0-rc.0 with SM2 Public Key Encryption enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.5 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Within 7 days: Identify all affected systems and apply vendor patches promptly. …
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