CVE-2025-59941: 
Análisis y mitigación de vulnerabilidades

A vulnerability (CVE-2025-59941) was discovered in go-f3, a Golang implementation of Fast Finality for Filecoin (F3), affecting versions 0.8.8 and below. The vulnerability was disclosed in September 2025 and involves a flaw in the justification verification caching mechanism where verification results are cached without properly considering the context of the message (GitHub Advisory).

The vulnerability exists in go-f3's justification verification caching mechanism. The issue occurs because the cached verification does not properly validate the relationship between the justification and the specific message context it's being used with. An attacker can exploit this by first submitting a valid message with a correct justification, then reusing the same cached justification in contexts where it would normally be invalid. The vulnerability has been assigned a CVSS v3.1 score of 5.9 (Moderate), with the vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L (GitHub Advisory).

The vulnerability could lead to consensus integrity issues through invalid justification acceptance and potentially affect network liveness if exploited systematically. It may allow malicious actors to influence consensus decisions with invalid justifications. However, exploitation requires significant power (350+ TiB due to power table rounding) and would be difficult to execute in a synchronized fashion that affects more than one-third of the network simultaneously (GitHub Advisory).

The vulnerability has been patched in go-f3 version 0.8.9. All node software including Lotus, Forest, and Venus are using the patched version of go-f3 with their updates for the nv27 network upgrade. No immediate workarounds are available, and nodes should upgrade to the patched version, which they will have done if participating in nv27 on Filecoin mainnet (GitHub Advisory).