Lighthouse v8.3.3: security release for Ethereum node operators

Summary

Lighthouse v8.3.3 (released 2026-11-09) includes security fixes according to its release notes. Ethereum node operators running Lighthouse should review and upgrade.

Affected

• Lighthouse (sigp/lighthouse) versions before v8.3.3

From the release notes

## Summary ⚠️ Lighthouse v8.3.3 is a high-priority patch release containing security fixes. All Lighthouse beacon nodes should be upgraded as soon as possible. Details of the vulnerabilities will be disclosed at a later date. There are no breaking changes in this release. If you are upgrading from v8.2.x or earlier, please read the v8.3.0 release notes. ## Update Priority User Class Beacon Node Validator Client Staking Users High Low Non-Staking Users High --- See Update Priorities for more information about this table. ## Security Content Links to security advisories will be provided here once network operators have had time to upgrade. You can read a blog post about our handling of vulnerabilities here: https://sigmaprime.io/blog/bug-reports/ ## All Changes - Release v8.3.3 - Update libp2p - Bump crypto-bigint - Build slasher tests as C17 to fix mdbx on GCC 15 (#10518)

Recommended actions

• Upgrade Lighthouse to v8.3.3 or later
• Check the release notes for any coordinated upgrade deadline or required configuration change

Source & attribution

This 0xCERT advisory relays the Lighthouse v8.3.3 release notes: https://github.com/sigp/lighthouse/releases/tag/v8.3.3. Refer to the upstream project for the authoritative record and any follow-up security advisories.