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Sei

Sei is the fastest Layer 1 blockchain, designed to scale with the industry. Pushing the boundaries of blockchain technology through open source development, Sei stands to unlock a brand new design space for consumer facing applications.

Sei
Blockchain
Bridge
L1
Staking
Go
Rust
Maximum Bounty
$500,000
Live Since
30 November 2023
Last Updated
24 March 2026
  • Triaged by Immunefi

  • PoC Required

  • KYC required

  • Arbitration enabled

Select the category you'd like to explore

Assets in Scope

Target
Name
Added on
14 January 2026
Target
Name
Added on
31 May 2024
Target
Name
Sei Chain
Added on
13 November 2023
Target
Primacy Of Impact
Name
Added on
6 February 2026
Target
Primacy Of Impact
Name
Added on
5 March 2026

Impacts in Scope

Impacts Body

Excluded Giga-Related Functionality

Any functionality related to Giga is currently out of scope for this bug bounty program.

Specifically, the following are excluded from scope:

  • Any code paths that require setting any GIGA_* configuration flag to true
  • Any configuration options defined under configuration sections prefixed with giga
  • All code contained within the giga Go package

All Giga-related configuration flags and settings are disabled by default in all supported environments.

As a result:

  • Vulnerabilities that are only exploitable when Giga-related configuration flags are enabled
  • Vulnerabilities that exist exclusively within the giga Go package
  • Vulnerabilities reachable solely through execution paths gated by Giga configuration

are not eligible for rewards under this bug bounty program.


Excluded StateSync Peer Functionality

Any functionality related to StateSync Peers is currently out of scope for this bug bounty program.

A StateSync Peer is a trusted node that provides state synchronization data to other nodes during initial sync. These are nodes explicitly configured as RPC servers and persistent peers for the purpose of state sync. They serve trust height, trust hash, and block/state data that the syncing node consumes directly.

Specifically, the following are excluded from scope:

  • Any vulnerabilities that require a malicious or compromised StateSync Peer to be exploited
  • Any attack vectors that depend on a StateSync Peer returning tampered block data, trust hashes, or state snapshots
  • Any vulnerabilities that rely on poisoning the persistent peers list with attacker-controlled node IDs obtained through compromised StateSync Peer RPC responses
  • Any vulnerabilities related to P2P-mode state sync, where any connected P2P peer can serve as a state provider. P2P-mode state sync is disabled by default and is not used in Sei's supported state sync workflow

StateSync Peers are considered trusted infrastructure within the Sei network's threat model. As a result:

  • Vulnerabilities that assume a StateSync Peer is acting maliciously or has been compromised
  • Vulnerabilities that are only exploitable by controlling or impersonating a StateSync Peer endpoint
  • Vulnerabilities reachable solely through tampered RPC responses from a trusted StateSync Peer
  • Vulnerabilities that exist exclusively within P2P-mode state sync code paths

are not eligible for rewards under this bug bounty program.

Severity
Critical
Title

Permanent freezing of funds with no on-chain remediation path, excluding general network unavailability (fix requires hard fork)

Severity
Critical
Title

Direct loss of funds (including but not limited to unauthorized transfers, token minting, or token burning)

Severity
High
Title

Crash or halt of ≥1/3 of validators (assuming no direct network access to validator nodes), resulting in loss of network liveness

Severity
High
Title

Unintended permanent chain split requiring hard fork to resolve (network partition with no automatic recovery)

Severity
High
Title

Crash of RPC nodes running default configuration without assuming direct network access (e.g. via malicious block/transaction payloads propagated through the network)

Severity
Medium
Title

Block production delay exceeding 2.5 seconds on realistic validator hardware, caused by crafted transactions or messages

Severity
Medium
Title

Malicious proposer block freeze: delay of ≥10 minutes caused by a single proposer beyond simply skipping their own proposal slot(s)

Severity
Medium
Title

Bug in layer 0/1/2 network code that causes deterministic unintended smart contract execution, with no funds directly at risk

Severity
Medium
Title

Crash of RPC nodes running default configuration via direct unauthenticated network access to RPC/gRPC endpoints

Severity
Medium
Title

Crash or halt of ≥10% but <1/3 of validators via crafted (non-brute-force) messages, where the network retains liveness

Severity
Low
Title

Manipulation of transaction fee calculation resulting in fees outside protocol-defined bounds

Severity
Low
Title

Causing network processing nodes to include or order mempool transactions outside of protocol-defined selection and priority rules

Out of scope

Default Out of Scope and rules

Blockchain/DLT specific

  • Incorrect data supplied by third party oracles
    • Not to exclude oracle manipulation/flash loan attacks
  • Impacts requiring basic economic and governance attacks (e.g. 51% attack)
  • Lack of liquidity impacts
  • Impacts from Sybil attacks
  • Impacts involving centralization risks

All categories

  • Impacts requiring attacks that the reporter has already exploited themselves, leading to damage
  • Impacts caused by attacks requiring access to leaked keys/credentials
  • Impacts caused by attacks requiring access to privileged addresses (including, but not limited to: governance and strategist contracts) without additional modifications to the privileges attributed
  • Impacts relying on attacks involving the depegging of an external stablecoin where the attacker does not directly cause the depegging due to a bug in code
  • Mentions of secrets, access tokens, API keys, private keys, etc. in Github will be considered out of scope without proof that they are in-use in production
  • Best practice recommendations
  • Feature requests
  • Impacts on test files and configuration files unless stated otherwise in the bug bounty program
  • Impacts requiring phishing or other social engineering attacks against project's employees and/or customers