CVE-2023-42448

HIGH

Published 2023-10-04T18:57:52.752Z

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CVSS Score

V3.1

8.1

/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Base Score Metrics

Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14

0.009

probability

of exploitation in the wild

There is a 0.9% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25

Exploit Probability

Percentile: 0.753

Higher than 75.3% of all CVEs

Attack Vector Metrics

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Impact Metrics

Confidentiality

NONE

Integrity

HIGH

Availability

HIGH

Description

Hydra is the layer-two scalability solution for Cardano. Prior to version 0.13.0, the specification states that the contestation period in the datum of the UTxO at the head validator must stay unchanged as the state progresses from Open to Closed (Close transaction), but no such check appears to be performed in the `checkClose` function of the head validator. This would allow a malicious participant to modify the contestation deadline of the head to either allow them to fanout the head without giving another participant the chance to contest, or prevent any participant from ever redistributing the funds locked in the head via a fan-out. Version 0.13.0 contains a patch for this issue.