CVE-2025-43866: vantage6 is an open-source infrastructure for privacy preserving analysis

Q: How do I fix CVE-2025-43866?

vantage6: upgrade to 4.11.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-43866 being exploited?

CVE-2025-43866 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-2025-43866 affect?

CVE-2025-43866 affects vantage6. Severity is high (CVSS 7.5). vantage6 is an open-source infrastructure for privacy preserving analysis. The JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as i

Q: How urgent is CVE-2025-43866?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2025-43866 is a high-severity flaw (CVSS 7.5) affecting vantage6. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

vantage6 is an open-source infrastructure for privacy preserving analysis. The JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as it is predictable to some extent. This vulnerability is fixed in 4.11.0.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-330
Published	2025-06-12
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: vantage6

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-06-12 18:15 UTCPublished CVE record published
2026-06-17 09:24 UTCUpdated Record last modified

vantage6 vantage6 UPGRADE

Affected: < 4.11.0

Fixed in: 4.11.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy vantage6 || rpm -q vantage6 || vantage6 --version

2. UPGRADE to 4.11.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade vantage6

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vantage6

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-2025-43866?

vantage6: upgrade to 4.11.0. Exact commands for each OS are on this page.

Is CVE-2025-43866 being exploited?

CVE-2025-43866 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-2025-43866 affect?

CVE-2025-43866 affects vantage6. Severity is high (CVSS 7.5). vantage6 is an open-source infrastructure for privacy preserving analysis. The JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as i

How urgent is CVE-2025-43866?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-43863 CRITICAL 9.8 UPGRADE vantage6 is an open source framework built to enable, manage and deploy privacy enhancing technologies like Fe

References

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