# CVE-2026-22698

## Summary

- **CVE ID:** CVE-2026-22698
- **Severity:** HIGH
- **CVSS Score:** 8.7 (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)
- **CWE:** CWE-331
- **Published:** Jan 10, 2026
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- RustCrypto — elliptic-curves (= 0.14.0-pre.0)
- RustCrypto — elliptic-curves (= 0.14.0-rc.0)

## References

- [CNA](https://github.com/RustCrypto/elliptic-curves/security/advisories/GHSA-w3g8-fp6j-wvqw)
- [CNA](https://github.com/RustCrypto/elliptic-curves/pull/1600)
- [CNA](https://github.com/RustCrypto/elliptic-curves/commit/4781762f23ff22ab34763410f648128055c93731)
- [CNA](https://github.com/RustCrypto/elliptic-curves/commit/e4f77788130d065d760e57fb109370827110a525)
- [CNA](https://crates.io/crates/sm2/0.14.0-pre.0)
- [CNA](https://crates.io/crates/sm2/0.14.0-rc.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 18.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._