CVE-2025-59942
📋 TL;DR
CVE-2025-59942 is an integer overflow vulnerability in go-f3's message validation that causes Filecoin nodes to panic and crash when processing specially crafted 'poison' messages. This affects all Filecoin nodes using go-f3 versions 0.8.6 and below for F3 consensus. Attackers can cause denial of service by sending malicious messages directly to vulnerable nodes.
💻 Affected Systems
- go-f3 (Filecoin Fast Finality implementation)
📦 What is this software?
Go F3 by Filecoin
⚠️ Risk & Real-World Impact
Worst Case
Sustained denial of service attacks could crash multiple Filecoin nodes, disrupting blockchain consensus and network availability.
Likely Case
Targeted nodes crash and restart, causing temporary service disruption until messages are cleared or patched.
If Mitigated
With proper network controls, only authorized nodes can send messages, limiting attack surface to trusted participants.
🎯 Exploit Status
Attack requires crafting specific 'poison' messages with signer index causing integer overflow. No authentication needed but requires direct message delivery to each target.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.8.7
Vendor Advisory: https://github.com/filecoin-project/go-f3/security/advisories/GHSA-g99p-47x7-mq88
Restart Required: Yes
Instructions:
1. Update go-f3 dependency to version 0.8.7 or higher. 2. Rebuild and redeploy Filecoin node software. 3. Restart all affected nodes.
🔧 Temporary Workarounds
Network Segmentation
allRestrict F3 message traffic to trusted nodes only using firewall rules.
🧯 If You Can't Patch
- Implement strict network ACLs to allow F3 messages only from trusted consensus participants
- Monitor for node crashes and restart automatically with process supervision
🔍 How to Verify
Check if Vulnerable:
Check go-f3 version in your Filecoin node dependencies. If using version 0.8.6 or below, you are vulnerable.Check Version:
Check your go.mod file for 'github.com/filecoin-project/go-f3' version or run 'go list -m github.com/filecoin-project/go-f3'Verify Fix Applied:
Verify go-f3 dependency is updated to 0.8.7 or higher in your build configuration.📡 Detection & Monitoring
Log Indicators:
- Node panic logs mentioning go-f3 validation
- Unexpected node restarts/crashes during consensus
Network Indicators:
- Unusual F3 message patterns from untrusted sources
- Spike in malformed message rejections
SIEM Query:
Process crashes with 'panic' AND component contains 'go-f3' OR 'F3'