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Parallel

https://github.com/parallel-protocol?utm_source=immunefi https://parallel.best/?utm_source=immunefi|

Parallel is a capital-efficient, modular stablecoins protocol that allows the creation of over-collateralized, decentralized stablecoins. The protocol consists of several different modules, which can be added or removed over time by the DAO, from which stablecoins can be issued or minted.

ETH Polygon Arbitrum Avalanche Base Gnosis LayerZero Optimism Scroll Sei BSC xDAI / Gnosis Chain Defi Stablecoin CDP DAO JavaScript NextJS ReactJS Solidity

Maximum Bounty $250,000 Live Since 02 October 2025 Last Updated 04 March 2026

Triaged by Immunefi
PoC Required
KYC required

[https://bugs.immunefi.com/dashboard/new-submission?utm_source=immunefi](Submit a Bug)

/bug-bounty/ /bug-bounty/parallel/information/#top /bug-bounty/parallel/scope/#top /bug-bounty/parallel/resources/#top

Rewards

Parallel provides rewards in USDp on Ethereum, denominated in USD.

Rewards by Threat Level

Smart Contract Critical Max: $250,000Min: $50,000

Primacy of Rules

High Max: $50,000Min: $10,000

Primacy of Rules

Medium Up to: $5,000 Primacy of Rules

Low Flat: $1,000 Primacy of Rules

Critical Reward Calculation

Mainnet assets:

Reward amount is 10% of the funds directly affected up to a maximum of:

$250,000 Minimum reward to discourage security researchers from withholding a bug report:

$50,000

Websites and Applications Critical Max: $50,000Min: $10,000

Primacy of Rules

High Up to: $2,500 Primacy of Rules

Medium Up to: $1,500 Primacy of Rules

Low Flat: $1,000 Primacy of Rules

Rewards Body

Rewards are distributed according to the impact of the vulnerability based on the [https://immunefi.com/immunefi-vulnerability-severity-classification-system-v2-3/](Immunefi Vulnerability Severity Classification System V2.3).

Reward Calculation for Critical Level Reports

For critical smart contract bugs, the reward amount is 10% of the funds directly affected up to a maximum of USD 250,000. The calculation of the amount of funds at risk is based on the time and date the bug report is submitted. However, a minimum reward of USD 50,000 is to be rewarded in order to incentivize security researchers against withholding a critical bug report.

For critical web/apps bugs, reports will be rewarded with USD $50,000, only if the impact leads to:

A loss of funds involving an attack that does not require any user action
Private key or private key generation leakage leading to unauthorized access to user funds

All other impacts that would be classified as Critical would be rewarded a flat amount of $10,000. The rest of the severity levels are paid out according to the Impact in Scope table.

Repeatable Attack Limitations

If the smart contract where the vulnerability exists can be upgraded or paused, only the initial attack will be considered for a reward. This is because the project can mitigate the risk of further exploitation by upgrading or pausing the component where the vulnerability exists. The reward amount will depend on the severity of the impact and the funds at risk.

For critical repeatable attacks on smart contracts that cannot be upgraded or paused, the project will consider the cumulative impact of the repeatable attacks for a reward. This is because the project cannot prevent the attacker from repeatedly exploiting the vulnerability until all funds are drained and/or other irreversible damage is done. Therefore, this warrants a reward equivalent to 10% of funds at risk, capped at the maximum critical reward.

Reward Calculation for High Level Reports

High vulnerabilities concerning theft/permanent freezing of unclaimed yield/royalties are rewarded within a range of $10,000 to $50,000 depending on the funds at risk, capped at the maximum high reward.

In the event of temporary freezing, the reward doubles from the full frozen value for every additional 24h that the funds are temporarily frozen, up until a max cap of the high reward. This is because as the duration of the freezing lengthens, the potential for greater damage and subsequent reputational harm intensifies. Thus, by increasing the reward proportionally with the frozen duration, the project ensures stronger incentives for bug disclosure of this nature.

Reward Payment Terms

Payouts are handled by the Parallel team directly and are denominated in USD. However, payments are done in USDp on Ethereum.

The calculation of the net amount rewarded is based on the average price between CoinMarketCap.com and CoinGecko.com at the time the bug report was submitted. No adjustments are made based on liquidity availability.

[/bug-bounty/parallel/scope/#impacts]( View impacts in scope)

Program Overview

Parallel is a decentralized protocol that issues stablecoins, the EUR stablecoin (PAR) and the USD stablecoin (paUSD), on the Ethereum and Polygon PoS blockchains. The PAR & paUSD stablecoin are decentralized, non-custodials, and collateral-backed FIAT stablecoins.

For more information about Parallel, please visit https://parallel.best/?utm_source=immunefi.

Parallel provides rewards in paUSD on Ethereum, denominated in USD. For more details about the payment process, please view the Rewards by Threat Level section.

Eligibility Criteria

Security researchers who wish to participate must adhere to the rules of engagement set forth in this program and cannot be:

On OFACs SDN list
Official contributor, both past or present
Employees and/or individuals closely associated with the project
Security auditors that directly or indirectly participated in the audit review

Primacy of Impact vs Primacy of Rules

Parallel adheres to the Primacy of Rules, which means that the whole bug bounty program is run strictly under the terms and conditions stated within this page.

Proof of Concept (PoC) Requirements

A PoC, demonstrating the bug's impact, is required for this program and has to comply with the [https://immunefisupport.zendesk.com/hc/en-us/articles/9946217628561-Proof-of-Concept-PoC-Guidelines-and-Rules?utm_source=immunefi](Immunefi PoC Guidelines and Rules).

Previous Audits

Parallel’s completed audit reports can be found at https://docs.mimo.capital/parallel-protocol/resources/security-audits?utm_source=immunefi. Any unfixed vulnerabilities mentioned in these reports are not eligible for a reward.

Audits

Auditor | Link | Completed at

| Bail Security | https://github.com/parallel-protocol/parallel-prl/blob/main/docs/audits/Bailsec%20-%20Parallel%20Protocol%20-%20PRL%20Token%20-%20Final%20Report%20-%20January%202025.pdf?utm_source=immunefi | 31 January 2025 | Zenith | https://github.com/parallel-protocol/parallel-prl/blob/main/docs/audits/Parallel%20Protocol%20-%20Zenith%20Audit%20Report.pdf?utm_source=immunefi | 19 February 2025 | Bail Security | https://github.com/parallel-protocol/parallel-parallelizer/blob/main/docs/audits/Bailsec%20-%20Parallel%20Protocol%20-%20V3%20Core%20-%20Final%20Report.pdf?utm_source=immunefi | 31 March 2025 | Certora | https://github.com/parallel-protocol/parallel-parallelizer/blob/main/docs/audits/Certora_Report_Parallel_Parallelizer_BridgeToken_final.pdf?utm_source=immunefi | 30 April 2025 |

Auditor Bail Security

Link https://github.com/parallel-protocol/parallel-prl/blob/main/docs/audits/Bailsec%20-%20Parallel%20Protocol%20-%20PRL%20Token%20-%20Final%20Report%20-%20January%202025.pdf?utm_source=immunefi

Completed at 31 January 2025

Auditor Zenith

Link https://github.com/parallel-protocol/parallel-prl/blob/main/docs/audits/Parallel%20Protocol%20-%20Zenith%20Audit%20Report.pdf?utm_source=immunefi

Completed at 19 February 2025

Auditor Bail Security

Link https://github.com/parallel-protocol/parallel-parallelizer/blob/main/docs/audits/Bailsec%20-%20Parallel%20Protocol%20-%20V3%20Core%20-%20Final%20Report.pdf?utm_source=immunefi

Completed at 31 March 2025

Auditor Certora

Link https://github.com/parallel-protocol/parallel-parallelizer/blob/main/docs/audits/Certora_Report_Parallel_Parallelizer_BridgeToken_final.pdf?utm_source=immunefi

Completed at 30 April 2025