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CVE-2026-22698— RustCrypto SM2-PKE has 32-bit Biased Nonce Vulnerability

Quick assessment

Affected
RustCrypto elliptic-curves
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RustCrypto: Elliptic Curves是Rust Crypto开源的一个Rust加密库。 RustCrypto: Elliptic Curves 0.14.0-pre.0版本和0.14.0-rc.0版本存在安全特征问题漏洞，该漏洞源于SM2公钥加密实现中临时随机数熵严重不足，可能导致加密被破解。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-22698

Vulnerability Information
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Vulnerability Title
RustCrypto SM2-PKE has 32-bit Biased Nonce Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息熵不充分
Source: CVE Program / CVE List V5
Vulnerability Title
RustCrypto: Elliptic Curves 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RustCrypto: Elliptic Curves是Rust Crypto开源的一个Rust加密库。 RustCrypto: Elliptic Curves 0.14.0-pre.0版本和0.14.0-rc.0版本存在安全特征问题漏洞，该漏洞源于SM2公钥加密实现中临时随机数熵严重不足，可能导致加密被破解。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
RustCrypto elliptic-curves = 0.14.0-pre.0 -

II. Public POCs for CVE-2026-22698

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III. Intelligence Information for CVE-2026-22698

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Patches & Fixes for CVE-2026-22698 (1)

Vendor Advisories for CVE-2026-22698 (1)

Same Patch Batch · RustCrypto · 2026-01-10 · 4 CVEs total

CVE-2026-22699 7.5 HIGH RustCrypto SM2-PKE has Unchecked AffinePoint Decoding (unwrap) in decrypt()
CVE-2026-22700 7.5 HIGH RustCrypto Has Insufficient Length Validation in decrypt() in SM2-PKE
CVE-2026-22705 6.4 MEDIUM RustCrypto: Signatures has timing side-channel in ML-DSA decomposition

IV. Related Vulnerabilities

Same product: elliptic-curves
Same vendor: RustCrypto
Same weakness: CWE-331

V. Comments for CVE-2026-22698

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