Vulnerability in Taiko Alethia Rollup Affects Ethereum-based Solutions
CVE-2025-66559

8HIGH

Key Information:

Vendor

Taikoxyz

Status
Taiko-mono
Vendor
CVE Published:
4 December 2025

What is CVE-2025-66559?

Taiko Alethia, a rollup designed for Ethereum scalability, contains a security flaw in versions 2.3.1 and earlier. The vulnerability arises within the _verifyBatches function where the local transition ID (tid) is updated before confirming the verification of a batch. If a subsequent check fails—such as the cooldown window not being passed or the transaction becoming invalid—the last verified batch could reference a transition ID that is incorrect as it may originate from an unverified upcoming batch. This can lead to corruption of the verified chain pointer, potentially affecting transaction integrity and security within the Ethereum network.

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Affected Version(s)

taiko-mono <= 2.3.1

References

https://github.com/taikoxyz/taiko-mono/security/advisorie...
x_refsource_CONFIRM
https://github.com/taikoxyz/taiko-mono/commit/379f5cb4ffe...
x_refsource_MISC

CVSS V4

Score:
8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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