What is the CVSS score of CVE-2026-22698?

CVE-2026-22698 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Sm2 Elliptic Curve are affected by CVE-2026-22698?

CVE-2026-22698 presents notable security risk rated CVSS 7.5. Exploitation could compromise the security of affected deployments.. A patch is available.

Is there a public PoC exploit available for CVE-2026-22698?

Yes, a public proof-of-concept exploit is available for CVE-2026-22698. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-22698?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Vendor patch is available.

Sm2 Elliptic Curve CVE-2026-22698

HIGH

Insufficient Entropy (CWE-331)

2026-01-10 security-advisories@github.com

GHSA-w3g8-fp6j-wvqw

Information Disclosure Sm2 Elliptic Curve

7.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.5 HIGH

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Mar 12, 2026 - 19:13 vuln.today

Public exploit code

Patch released

Mar 12, 2026 - 19:13 nvd

Patch available

CVE Published

Jan 10, 2026 - 06:15 nvd

HIGH 7.5

DescriptionGitHub 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. A patch is available for affected deployments.

Technical ContextAI

Affects Sm2 Elliptic Curve. 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