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GHSA-8986-v76q-8vr2

HighCVSS 7.5 / 10
Published Mar 2, 2026·Last modified Mar 4, 2026
Affected Components(0)

No affected components available

Description

Overview

P2PKH has 20 bytes just like P2SH. We protect against revealing P2PKH deposits by manually assembling the expected P2SH script in the smart contract and comparing hashes. However, we missed the case when the attacker embeds a valid P2SH inside of P2PKH as an output script. bitcoin-spv library extracts the P2SH from P2PKH and we treat it as a valid P2SH output.

This does not lead to stealing funds but can lead to protocol insolvency.

The off-chain client handles this case correctly, but the problem is in the optimistic minting bot. The bot assumes that if the funding TX exists on Bitcoin with the right amount and it was successfully revealed, the transaction is valid.

https://bugs.immunefi.com/magnus/672/projects/502/bug-bounty/reports/55982

Steps

Since there is a 24-hour governance delay on upgrading the Bridge smart contract, we are going to pause optimistic minting.

  1. Pause optimistic minting.
  2. Deploy new Bridge implementation with Deposit library containing a fix, WITHOUT VERIFYING THE CODE on Etherscan.
  3. Schedule upgrade transaction.
  4. After 24 hours, finalize upgrade.
  5. Unpause optimistic minting.
Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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