CVE-2026-22698

HIGH EPSS 15.6%
Published Jan 10, 20265mo ago · Modified Jun 17, 20262w ago
8.7 CVSS 4.0
High
Find Similar
Published Jan 10, 2026 5mo ago
Last Modified Jun 17, 2026 2w 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.

CVSS Details

Base Score
8.7
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
15.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-331

Affected Products 2

VendorProductVersionRange
rustcryptosm2_elliptic_curve0.14.0any
rustcryptosm2_elliptic_curve0.14.0any

References 6

  • crates.io https://crates.io/crates/sm2/0.14.0-pre.0
    Release Notes
  • crates.io https://crates.io/crates/sm2/0.14.0-rc.0
    Release Notes
  • github.com https://github.com/RustCrypto/elliptic-curves/commit/4781762f23ff22ab34763410f648128055c93731
    Patch
  • github.com https://github.com/RustCrypto/elliptic-curves/commit/e4f77788130d065d760e57fb109370827110a525
    Patch
  • github.com https://github.com/RustCrypto/elliptic-curves/pull/1600
    Issue TrackingPatch
  • github.com https://github.com/RustCrypto/elliptic-curves/security/advisories/GHSA-w3g8-fp6j-wvqw
    ExploitMitigationVendor Advisory

Remediation

  • github.com https://github.com/RustCrypto/elliptic-curves/commit/4781762f23ff22ab34763410f648128055c93731
    Patch
  • github.com https://github.com/RustCrypto/elliptic-curves/commit/e4f77788130d065d760e57fb109370827110a525
    Patch
  • github.com https://github.com/RustCrypto/elliptic-curves/pull/1600
    Issue TrackingPatch