How severe is GHSA-2fcv-qww3-9v6h?

No CVSS score has been assigned to GHSA-2fcv-qww3-9v6h yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-2fcv-qww3-9v6h?

GHSA-2fcv-qww3-9v6h affects the following packages: github.com/babylonlabs-io/babylon/v4 (Go). Ecosystems affected: Go.

How do I fix GHSA-2fcv-qww3-9v6h?

Update github.com/babylonlabs-io/babylon/v4 to 4.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2fcv-qww3-9v6h is resolved across your whole dependency graph.

How do I detect GHSA-2fcv-qww3-9v6h in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/babylonlabs-io/babylon/v4, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-2fcv-qww3-9v6h if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-2fcv-qww3-9v6h actively exploited in the wild?

No public exploit code has been indexed for GHSA-2fcv-qww3-9v6h yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-2fcv-qww3-9v6h published, and has it been updated?

GHSA-2fcv-qww3-9v6h was published on November 24, 2025 and was last updated on November 27, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

Not in CISA KEV

Babylon's malformed vote extensions are not rejectedGHSA-2fcv-qww3-9v6h

Fix: babylonlabs-io/babylon#1873

GHSA-2fcv-qww3-9v6h is a security vulnerability in github.com/babylonlabs-io/babylon/v4. A fix is available for github.com/babylonlabs-io/babylon/v4 — see the affected versions and patch details below.

Also known asGO-2025-4157

Published

Nov 24, 2025

Updated

Nov 27, 2025

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 27, 2025 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🐹github.com/babylonlabs-io/babylon/v4

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Summary

Adversarial validators can send large vote extensions by using non-existing protobuf tags. This will result in the rejection of the subsequent block proposal. Eventually, all block proposals will be rejected by all validators.

Impact

A small group of adversarial validators can cause a chain halt.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/babylonlabs-io/babylon/v4`	all versions	4.1.0`go get github.com/babylonlabs-io/babylon/v4@v4.1.0`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/babylonlabs-io/babylon/v4, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/babylonlabs-io/babylon/v4 to 4.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2fcv-qww3-9v6h is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Summary Adversarial validators can send large vote extensions by using non-existing protobuf tags. This will result in the rejection of the subsequent block proposal. Eventually, all block proposals will be rejected by all validators. ### Impact A small group of adversarial validators can cause a chain halt.

O3 Security · Impact-Aware SCA

Is GHSA-2fcv-qww3-9v6h in your dependencies?

Find it across Go, including transitive dependencies.

Scan my dependencies How O3 SCA works