AIKIDO-2025-10225
tendermint-light-client-verifier is vulnerable to Authentication Bypass by Spoofing
91
Critical Risk
This Affects:
tendermint-light-client-verifierTL;DR
Affected versions of the tendermint-rs package are vulnerable to a critical flaw in the light client implementation due to improper validation of validator identities. Specifically, the client fails to ensure that a validator’s address is correctly derived from its public key when counting votes. This allows an attacker to spoof validator signatures and forge a malicious block that appears to be signed by a 2/3+ majority, causing the light client to incorrectly trust and accept the block.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
tendermint-light-client-verifier is vulnerable to Authentication Bypass by Spoofing in versions 0.23.0 - 0.40.2.
How to fix this
Upgrade the tendermint-light-client-verifier library to the patch version.
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