CVE-2026-22699: Rustcrypto SM2 Elliptic Curve

High severity, CVSS 7.5. EPSS: 0.4% 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 PKE decryption path where an invalid elliptic-curve point (C1) is decoded and the resulting value is unwrapped without checking. Specifically, AffinePoint::from_encoded_point(&encoded_c1) may return a None/CtOption::None when the supplied coordinates are syntactically valid but do not lie on the SM2 curve. The calling code previously used .unwrap(), causing a panic when presented with such input. This issue has been patched via commit 085b7be.

Affected products

• Rustcrypto SM2 Elliptic Curve: version 0.14.0 only

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