---
id: CVE-2025-59941
title: go-f3 is a Golang implementation of Fast Finality for Filecoin (F3)
summary: >-
  go-f3 is a Golang implementation of Fast Finality for Filecoin (F3). In
  versions 0.8.8 and below, go-f3's justification verification caching mechanism
  has a vulnerability where verification results are cached without properly
  considering…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L'
cwe:
  - CWE-305
vendor: filecoin
product: go-f3
affected:
  - go-f3 < 0.8.9
patched:
  - go-f3 0.8.9
published: '2025-09-29'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T09:10:00.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-59941'
references:
  - url: >-
      https://github.com/filecoin-project/go-f3/commit/76fff18cf07b21baccf537024bdb2fb41f75f6e2#diff-e1f646cea41790e1642e4e649c9e3c526344736d67222201703e1c29c23e9625
    label: security-advisories@github.com
  - url: >-
      https://github.com/filecoin-project/go-f3/security/advisories/GHSA-7pq9-rf9p-wcrf
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00239
epssPercentile: 0.13753
ingestedAt: '2026-10-09T09:31:00.993Z'
---

## Overview

go-f3 is a Golang implementation of Fast Finality for Filecoin (F3). In versions 0.8.8 and below, go-f3's justification verification caching mechanism has a vulnerability where verification results are cached without properly considering the context of the message. An attacker can bypass justification verification by submitting a valid message with a correct justification and then reusing the same cached justification in contexts where it would normally be invalid. This occurs because the cached verification does not properly validate the relationship between the justification and the specific message context it's being used with. This issue is fixed in version 0.8.9.

## Affected

- `go-f3 < 0.8.9`

## Remediation

Upgrade past the affected range:

- `go-f3 0.8.9`