CVE-2025-59941: go-f3 is a Golang implementation of Fast Finality for Filecoin (F3)

Q: How do I fix CVE-2025-59941?

go-f3: upgrade to 0.8.9. Exact commands for each OS are on this page.

Q: Is CVE-2025-59941 being exploited?

CVE-2025-59941 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-59941 affect?

CVE-2025-59941 affects go-f3. Severity is medium (CVSS 5.9). 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 th

Q: How urgent is CVE-2025-59941?

Priority 25/100. No elevated risk signals yet.

Routine

MEDIUM 5.9UPGRADE

CVE-2025-59941 is a medium-severity flaw (CVSS 5.9) affecting go-f3. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 n

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-305
Published	2025-09-29
Last modified	2026-10-09

Publisher (CNA): GitHub, Inc. · Vendor: filecoin

Last updated 2026-10-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-29 23:15 UTCPublished CVE record published
2026-10-09 09:10 UTCUpdated Record last modified

filecoin go-f3 UPGRADE

Affected: < 0.8.9

Fixed in: 0.8.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy go-f3 || rpm -q go-f3 || go-f3 --version

2. UPGRADE to 0.8.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade go-f3

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade go-f3

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-59941?

go-f3: upgrade to 0.8.9. Exact commands for each OS are on this page.

Is CVE-2025-59941 being exploited?

CVE-2025-59941 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-59941 affect?

CVE-2025-59941 affects go-f3. Severity is medium (CVSS 5.9). 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 th

How urgent is CVE-2025-59941?

Priority 25/100. No elevated risk signals yet.

Software pages

Go (Golang) vulnerabilities

Related CVEs

CVE-2025-59942 HIGH 7.5 UPGRADE go-f3 is a Golang implementation of Fast Finality for Filecoin (F3)

References

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