Platform
javascript
Component
marginal
Fixed in
1.0.1
CVE-2026-4931 describes an unsafe downcast vulnerability within the Marginal smart contract, specifically affecting versions 1.0.0 through 1. This flaw allows attackers to exploit a discrepancy in asset valuation, enabling them to settle substantial debt positions at a significantly reduced cost. A fix is available in version 1.10.0, and users are strongly advised to upgrade.
The core of this vulnerability lies in an unsafe downcast operation within the Marginal smart contract. This allows an attacker to manipulate the contract's internal state, effectively reducing the cost required to settle a large debt. The financial impact can be substantial, potentially leading to significant losses for lenders or other participants in the DeFi ecosystem utilizing Marginal. This could manifest as an attacker draining funds from a lending pool or manipulating collateralization ratios to their advantage. The blast radius extends to any application or protocol built on top of Marginal, as the vulnerability directly impacts the contract's core logic.
CVE-2026-4931 was publicly disclosed on 2026-04-07. There are currently no publicly available proof-of-concept exploits. The EPSS score is pending evaluation, but the potential for financial impact suggests a medium to high probability of exploitation if left unaddressed. This vulnerability highlights the importance of rigorous security audits and formal verification of smart contracts before deployment.
Exploit Status
EPSS
0.04% (12% percentile)
The primary mitigation strategy is to upgrade to version 1.10.0 of the Marginal smart contract. This version incorporates a fix that addresses the unsafe downcast vulnerability. For systems unable to immediately upgrade, consider implementing temporary restrictions on large debt settlements within the Marginal contract. This could involve setting limits on the size of debt positions that can be settled or introducing additional verification steps before settlement is allowed. Monitoring the contract's state for unusual settlement patterns can also help detect potential exploitation attempts. After upgrading, thoroughly test the contract's functionality to ensure the fix has been successfully applied and does not introduce any regressions.
Update the Marginal smart contract to version 1.10.0 or higher to mitigate the vulnerability. This update corrects the unsafe type conversion handling, preventing attackers from exploiting the possibility of liquidating large debts with a minimal cost.
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CVE-2026-4931 describes a vulnerability in the Marginal smart contract where an unsafe downcast allows attackers to settle large debts for minimal cost, potentially leading to financial losses.
If you use Marginal smart contract versions 1.0.0–1 in your DeFi application or hold assets/liabilities within it, you are potentially affected. Upgrade to v1.10.0.
Upgrade your Marginal smart contract to version 1.10.0. Consider temporary restrictions on large debt settlements as a workaround if immediate upgrade is not possible.
As of now, there are no confirmed reports of active exploitation, but the potential for financial impact warrants immediate attention and mitigation.
Refer to the official Marginal project documentation and communication channels for the latest advisory and updates regarding CVE-2026-4931.
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