CVE-2025-59941Network attack vector

Consensus manipulation via context-free justification cache

Published Sep 29, 2025 · Updated Sep 29, 2025

Authentication bypass in Filecoin go-f3 before 0.8.9 allows remote authenticated users to influence consensus with invalid justifications. The justification verifier caches a successful result without binding the cache entry to the message context, so a valid justification is accepted again for an incompatible vote. Meaningful exploitation requires at least 350 TiB of storage power and synchronized disruption of more than one-third of the network; consequences are consensus-integrity loss and reduced liveness.

CVSS severity5.9
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Filecoin go-f3 before 0.8.9 allows remote authenticated users to influence consensus with invalid justifications. The justification verifier caches a successful result without binding the cache entry to the message context, so a valid justification is accepted again for an incompatible vote. Meaningful exploitation requires at least 350 TiB of storage power and synchronized disruption of more than one-third of the network; consequences are consensus-integrity loss and reduced liveness.

The record

CVE
CVE-2025-59941
Published
Sep 29, 2025
Updated
Sep 29, 2025
Vendor
Filecoin
Product
go-f3
Classifications
CWE-305
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.8.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Filecoin · go-f3version=< 0.8.9

Published CVSS scores

5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
6.5NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-305Authentication Bypass by Primary Weakness

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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