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CVE-2023-42448— Hydra's contestation period in head datum can be modified during Close transaction, allowing malicious participant to freely modify the contestation deadline

Quick assessment

Affected
input-output-hk hydra
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hydra是一款渗透测试工具。 Hydra 0.13.0之前版本存在输入验证错误漏洞，该漏洞源于允许恶意参与者修改头部的竞争截止日期。

CVSS 8.1 · High EPSS 0.98% · P61

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-42448

Vulnerability Information
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Vulnerability Title
Hydra's contestation period in head datum can be modified during Close transaction, allowing malicious participant to freely modify the contestation deadline
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Hydra 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hydra是一款渗透测试工具。 Hydra 0.13.0之前版本存在输入验证错误漏洞，该漏洞源于允许恶意参与者修改头部的竞争截止日期。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
input-output-hk hydra < 0.13.0 -

II. Public POCs for CVE-2023-42448

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7834 chars
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III. Intelligence Information for CVE-2023-42448

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Patches & Fixes for CVE-2023-42448 (1)

Vendor Advisories for CVE-2023-42448 (1)

Other References for CVE-2023-42448 (3)

Same Patch Batch · input-output-hk · 2023-10-04 · 3 CVEs total

CVE-2023-38701 9.1 CRITICAL Hydra's committed UTxOs at Commit validator and UTxOs at Initial validator can be spent ar
CVE-2023-42449 8.1 HIGH Malicious head initialiser can extract PTs from control of Hydra scripts, leading to locke

IV. Related Vulnerabilities

Same product: hydra
Same vendor: input-output-hk
Same weakness: CWE-20

V. Comments for CVE-2023-42448

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