What’s Vulnerable › Vulnerabilities

CVE-2020-13822: Signature Malleabillity in elliptic

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-06-04 · updated 2026-06-17
• Weakness: CWE-190

Description

The Elliptic package 6.5.2 for Node.js allows ECDSA signature malleability via variations in encoding, leading '\0' bytes, or integer overflows. This could conceivably have a security-relevant impact if an application relied on a single canonical signature.

Affected products

• Elliptic: 6.5.2
• Npm Elliptic: before 6.5.3 — fixed in 6.5.3

How to fix

Upgrade to a fixed version: Npm Elliptic 6.5.3. Check the vendor advisory for mitigations.

References

• https://github.com/indutny/elliptic/issues/226
• https://medium.com/%40herman_10687/malleability-attack-why-it-matters-7b5f59fb99a4
• https://www.npmjs.com/package/elliptic
• https://yondon.blog/2019/01/01/how-not-to-use-ecdsa/
• https://github.com/indutny/elliptic/issues/226
• https://medium.com/%40herman_10687/malleability-attack-why-it-matters-7b5f59fb99a4
• https://www.npmjs.com/package/elliptic
• https://yondon.blog/2019/01/01/how-not-to-use-ecdsa/

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