# CometBFT's state syncing validator from malicious node may lead to a chain split

Source: https://junglewise.ai/threats/cometbft-s-state-syncing-validator-from-malicious-node-may-lead-to-a-f4503c58  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-09-03  
License: CC BY 4.0 with a link back

Severity: low · CVSS 3.1 · Published 2024-09-03

CometBFT's state syncing validator from malicious node may lead to a chain split

Technologies: [github.com/cometbft/cometbft (Go)](https://junglewise.ai/threats/technologies/github-com-cometbft-cometbft). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Low severity, with a CVSS score of 3.1, published 3 September 2024.

**Which products and versions are affected?** github.com/cometbft/cometbft (Go) SEMVER:introduced=0.37.0,fixed=0.37.11; github.com/cometbft/cometbft/light (Go) SEMVER:introduced=0.34.0,fixed=0.34.34.

**Is there a fix for This vulnerability?** Yes. github.com/cometbft/cometbft (Go): upgrade to 0.37.11 or later; github.com/cometbft/cometbft/light (Go): upgrade to 0.34.34 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run github.com/cometbft/cometbft (Go) or github.com/cometbft/cometbft/light (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/cometbft/cometbft (Go): upgrade to 0.37.11 or later

  ```sh
  go get github.com/cometbft/cometbft@v0.37.11
  ```

- github.com/cometbft/cometbft/light (Go): upgrade to 0.34.34 or later

  ```sh
  go get github.com/cometbft/cometbft/light@v0.34.34
  ```


## Affected products

- github.com/cometbft/cometbft (Go) SEMVER:introduced=0.37.0,fixed=0.37.11
- github.com/cometbft/cometbft/light (Go) SEMVER:introduced=0.34.0,fixed=0.34.34

## Related threats

- [GO-2026-4361 - Inconsistencies between how commit signatures are verified and how block time is derived in…](https://junglewise.ai/threats/go-2026-4361-inconsistencies-between-how-commit-signatures-are-verified-92e2eeac)
- [CometBFT has inconsistencies between how commit signatures are verified and how block time is derived](https://junglewise.ai/threats/cometbft-has-inconsistencies-between-how-commit-signatures-are-verified-17e99f94)
- [GO-2025-4025 - CometBFT's invalid BitArray handling can lead to network halt in github.com/cometbft/cometbft](https://junglewise.ai/threats/go-2025-4025-cometbft-s-invalid-bitarray-handling-can-lead-to-network-6ea1281e)
- [CometBFT's invalid BitArray handling can lead to network halt](https://junglewise.ai/threats/cometbft-s-invalid-bitarray-handling-can-lead-to-network-halt-df96de9f)
- [GO-2025-3443 - CometBFT allows a malicious peer to stall network by disseminating valid-looking block parts in…](https://junglewise.ai/threats/go-2025-3443-cometbft-allows-a-malicious-peer-to-stall-network-by-84bcffee)