CVE-2026-22700: Rustcrypto SM2 Elliptic Curve

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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 denial-of-service vulnerability exists in the SM2 public-key encryption (PKE) implementation: the decrypt() path performs unchecked slice::split_at operations on input buffers derived from untrusted ciphertext. An attacker can submit short/undersized ciphertext or carefully-crafted DER-encoded structures to trigger bounds-check panics (Rust unwinding) which crash the calling thread or process. This issue has been patched via commit e60e991.

Affected products

• Rustcrypto SM2 Elliptic Curve: version 0.14.0 only

Published 2026-01-10. Last modified 2026-06-17.