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High, CVSS 8.9

Babylon vulnerable to chain halt when a message modifies the validator set at the epoch boundary

GHSA-rj53-j6jw-7f7g

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/babylonlabs-io/babylon/v2 2.1.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.9 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H · score source
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary Sending a message that modifies the validator set at the epoch boundary halts the chain. Impact Denial of Service - Comos-sdk prevents modifying the validator set from two different modules - https://github.com/cosmos/cosmos-sdk/blob/release/v0.50.x/types/module/module.go#L811. Such an operation leads to panic and chain halt. Detailed Post mortem https://boiling-lake-106.notion.site/2025-06-18-Genesis-mainnet-chain-halt-post-mortem-229f60cc1b5f80b7adf5e3ea0541ea87

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-rj53-j6jw-7f7g

Agent brief

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# Patch Next advisory brief: GHSA-rj53-j6jw-7f7g

Advisory: Babylon vulnerable to chain halt when a message modifies the validator set at the epoch boundary
IDs: GHSA-rj53-j6jw-7f7g
Record: https://patchnext.com/advisories/ghsa-rj53-j6jw-7f7g (revision 1, source checked 26 Oct 2026, 15:09 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/babylonlabs-io/babylon/v2 2.1.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/babylonlabs-io/babylon/v2: affected >= 2.0.0, < 2.1.0; fixed in 2.1.0

## Suggested inspection (read-only)
- Go github.com/babylonlabs-io/babylon/v2: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/babylonlabs-io/babylon/v2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-rj53-j6jw-7f7g (GitHub-reviewed advisory GHSA-rj53-j6jw-7f7g lists affected ranges: Go github.com/babylonlabs-io/babylon/v2 >=2.0.0 <2.1.0)

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