The published Hyperliquid bridge audits cover historical Solidity contracts on Arbitrum—not every Hyperliquid transfer route or the current state of a deployed bridge. Zellic reported a nested reentrancy-guard bug that blocked withdrawal finalization in its reviewed snapshot, plus a pending-operation concern; Cyfrin documented separate signature-validation and validator-set issues. The reports record fixes or resolutions for some findings, but do not establish which code or administrative settings are live now.
Which Hyperliquid bridge did the audits examine?
“Hyperliquid bridge” can mean different systems. Hyperliquid’s audit index identifies the Zellic assessment as covering the legacy bridge contract. Zellic reviewed the Solidity contracts Bridge2 and Signature on Arbitrum at repository commit 43b5267c58778e5e24640c9abac06cb608d63c40. Cyfrin’s earlier review covered Bridge.sol and Signature.sol at commit e0aff46. These are distinct code snapshots, so their findings should not be combined into a single tally of current vulnerabilities.
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The reports are useful for understanding specific historical code and its risks. They do not verify the bytecode, validator roles, pause state, or remediation status of any particular present-day deployment.
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Nested reentrancy guards blocked withdrawal finalization
Zellic found that batchedFinalizeWithdrawals calls the private finalizeWithdrawal function, while both functions use nonReentrant. Because the inner call enters a function with the same reentrancy guard while the outer function is still executing, finalization reverted in the reviewed snapshot. The practical consequence was that withdrawals could not be finalized through this path.
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Zellic classified this as high impact. Its report records that contributors acknowledged the issue and implemented a fix in commit e5b7e068. That report entry documents a code change; it does not by itself show that the change was deployed to every relevant bridge instance.
Paused contracts could retain disputed operations
The report also describes validator-approved operations that wait through a dispute period before processing. In the audited snapshot, if a malicious withdrawal was detected and the contract paused, the pending operation could not be removed. Zellic observed that it could remain pending and be processed after unpausing. The report records a remediation commit, 8c4a182a; it does not establish the state of a live deployment.
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What did Cyfrin report about signatures and validator authority?
Cyfrin’s review covered an earlier snapshot and identified issues distinct from Zellic’s findings. Its summary marks two medium-severity findings resolved and a low-severity finding acknowledged, alongside informational observations.
- Signature validation and validator-set updates: Cyfrin reported concerns involving bad signature recovery, signature malleability, and missing zero-address protection in
updateValidatorSet. Its summary marks the finding resolved. - Initialization and power thresholds: A second medium-severity finding concerned validation of initialization and power-threshold values. Cyfrin also marks this finding resolved.
- Low-severity item: The report summary marks one low finding acknowledged. Acknowledgment is not the same as evidence that a particular production deployment contains a fix.
These are findings in the assessed Solidity implementation, not proof that the same conditions are exploitable in code currently in use.
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How do the two reports compare?
| Report | Contracts and snapshot | Reported findings | Recorded remediation status | Scope and timing |
|---|---|---|---|---|
| Zellic, 2023 | Bridge2 and Signature on Arbitrum; commit 43b5267c58778e5e24640c9abac06cb608d63c40 |
Six total: zero critical, one high-impact, one medium-impact, and four informational | Report records acknowledged nested-guard issue and fix commit e5b7e068; pending-operation remediation commit 8c4a182a |
Three consultants and four person-days; primary review July 10–12, closing call August 8 |
| Cyfrin, 2023 | Bridge.sol and Signature.sol; commit e0aff46 |
Two medium findings marked resolved, one low finding marked acknowledged, and informational observations | Summary marks the two medium findings resolved and the low finding acknowledged | One-week review limited to security aspects of the Solidity implementation |
The impact labels and summaries belong to each auditor’s own report and scope; they are not a shared severity scale or a present-day vulnerability count.
What did the audits exclude, and what can they establish?
Zellic’s report says the engagement excluded other Hyperliquid smart contracts, off-chain components including validators, front-end components, project infrastructure, and key custody. It also cautions that a time-boxed assessment has coverage limits. Cyfrin limited its review to security aspects of the Solidity implementation and excluded a Rust test file.
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Accordingly, the reports provide evidence about specified contract snapshots, not a system-wide safety guarantee. The available audit material does not identify a particular current deployment or verify its bytecode, administrative roles, pause state, or whether each recorded remediation is present in production.
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No such equivalence is established by these reports. Hyperliquid’s HyperEVM developer documentation describes HyperEVM as part of Hyperliquid execution, with HYPE as native gas, mainnet chain ID 999, and JSON-RPC endpoint https://rpc.hyperliquid.xyz/evm. Its HyperEVM onboarding guide describes transfers between HyperCore spot balances and HyperEVM, and separately lists third-party bridge or swap routes for bringing assets from other chains. Those descriptions are context for other flows, not evidence that those routes use the legacy Arbitrum contracts reviewed by Zellic and Cyfrin.
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Quick Recap
How should a reader use these reports?
- Match the report’s contract names, chain, and repository commit to the code or deployment you want to assess; a similar bridge label is not enough.
- Read a reported fix as evidence about the reviewed code history, not confirmation that a fix is active on-chain.
- For a present-day security judgment, verify the exact deployed bytecode and administrative configuration and account for components the audits excluded.
- For asset movement, distinguish a legacy Arbitrum bridge contract from HyperCore-to-HyperEVM transfers and routes from other chains.
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