CVE-2026-4931Public exploitNetwork attack vector

Protocol liquidity theft via truncated margin values

Published Apr 7, 2026 · Updated Apr 7, 2026

Numeric truncation in Marginal v1 Core Smart Contracts version 1 allows remote attackers to settle large debt positions for negligible assets. MarginalV1Pool.adjust() directly casts each calculated margin value from uint256 to uint128, discarding high-order bits when the value exceeds the narrower type. The permissionless path requires constructing an oversized margin through a flash-loan transaction; successful exploitation underpays debt and can drain protocol liquidity.

CVSS severity6.8
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Numeric truncation in Marginal v1 Core Smart Contracts version 1 allows remote attackers to settle large debt positions for negligible assets. MarginalV1Pool.adjust() directly casts each calculated margin value from uint256 to uint128, discarding high-order bits when the value exceeds the narrower type. The permissionless path requires constructing an oversized margin through a flash-loan transaction; successful exploitation underpays debt and can drain protocol liquidity.

The record

CVE
CVE-2026-4931
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
Marginal
Product
Marginal v1 Core Smart Contracts
Classifications
CWE-681, T1657
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Marginal · Marginal v1 Core Smart Contractsversion=1

Published CVSS scores

6.8CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
8.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-681Incorrect Conversion between Numeric Types
T1657Financial Theft

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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