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

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

https://cvefeed.io/rssfeed/latest.atom / Sat, 01/10/2026 - 07:57
CVE ID : CVE-2026-22698
Published : Jan. 10, 2026, 5:17 a.m. | 1 hour, 8 minutes ago
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.
Severity: 0.0 | NA
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