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Vulnerability record · CVE-2026-22699 · published 10 January 2026

CVE-2026-22699: Rustcrypto sm2 elliptic curve improper input validation vulnerability

Rustcrypto · Sm2 Elliptic Curve

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.

7.5 CVSS 3.1 High EPSS 0.43% · top 65.6% CWE-20 · Improper input validation
7.5CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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 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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/RustCrypto/elliptic-curves/commit/085b7bee647029bd189e1375203418205006bcab Patch
https://github.com/RustCrypto/elliptic-curves/pull/1602 Issue TrackingPatch
https://github.com/RustCrypto/elliptic-curves/security/advisories/GHSA-78p6-6878-8mj6 ExploitVendor Advisory
https://github.com/RustCrypto/elliptic-curves/security/advisories/GHSA-78p6-6878-8mj6 ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-22699), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.