CVE-2026-22698 (GCVE-0-2026-22698)
Vulnerability from cvelistv5 – Published: 2026-01-10 05:17 – Updated: 2026-01-12 16:48
VLAI
EPSS
VEX
Title
RustCrypto SM2-PKE has 32-bit Biased Nonce Vulnerability
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-12 16:47 UTC
CWE
- CWE-331 - Insufficient Entropy
Assigner
GitHub_M
CNA
References
6 references
| URL | Tags |
|---|---|
| https://github.com/RustCrypto/elliptic-curves/sec… | x_refsource_CONFIRM |
| https://github.com/RustCrypto/elliptic-curves/pull/1600 | x_refsource_MISC |
| https://github.com/RustCrypto/elliptic-curves/com… | x_refsource_MISC |
| https://github.com/RustCrypto/elliptic-curves/com… | x_refsource_MISC |
| https://crates.io/crates/sm2/0.14.0-pre.0 | x_refsource_MISC |
| https://crates.io/crates/sm2/0.14.0-rc.0 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| RustCrypto | elliptic-curves |
Affected:
= 0.14.0-pre.0
Affected: = 0.14.0-rc.0 |
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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