CVE-2026-4931: Smart contract Marginal v1 performs unsafe downcast, allowing attackers to settle a large debt position for a

Q: How do I fix CVE-2026-4931?

v1-core: upgrade to newer than 1.0.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-4931 being exploited?

CVE-2026-4931 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-4931 affect?

CVE-2026-4931 affects v1-core. Severity is high (CVSS 8.6). Smart contract Marginal v1 performs unsafe downcast, allowing attackers to settle a large debt position for a negligible asset cost.

Q: How urgent is CVE-2026-4931?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 8.6REMOTEUPGRADE

CVE-2026-4931 is a high-severity flaw (CVSS 8.6) affecting v1-core. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-681
Published	2026-04-07
Last modified	2026-10-26

Publisher (CNA): CERT/CC · Vendor: marginal

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 16:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

marginal v1-core UPGRADE

Affected: <= 1.0.2

Fixed in: newer than 1.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy v1-core || rpm -q v1-core || v1-core --version

2. UPGRADE to newer than 1.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade v1-core

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade v1-core

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4931?

v1-core: upgrade to newer than 1.0.2. Exact commands for each OS are on this page.

Is CVE-2026-4931 being exploited?

CVE-2026-4931 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4931 affect?

CVE-2026-4931 affects v1-core. Severity is high (CVSS 8.6). Smart contract Marginal v1 performs unsafe downcast, allowing attackers to settle a large debt position for a negligible asset cost.

How urgent is CVE-2026-4931?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

References

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