How severe is CVE-2026-12566?

CVE-2026-12566 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-12566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-12566?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-12566 have an EU (EUVD) identifier?

Yes. CVE-2026-12566 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37814.

When was CVE-2026-12566 published?

CVE-2026-12566 was published on 2026-06-17 and last updated on 2026-06-22.

CVE-2026-12566

CVE-2026-12566 is a low-severity vulnerability with a CVSS 3.x base score of 3.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Low (CVSS 3.x base score 3.1)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37814
Weakness: CWE-918
Published: 2026-06-17
Last modified: 2026-06-22

Description

The docker_pull module uses the realm parameter from a Docker registry's WWW-Authenticate response header as the authentication endpoint without validation. An attacker in a man-in-the-middle position between bbot and a Docker registry could modify this header to redirect the authentication request to an arbitrary endpoint, potentially leaking authentication tokens.

Frequently asked questions

What is CVE-2026-12566?: The docker_pull module uses the realm parameter from a Docker registry's WWW-Authenticate response header as the authentication endpoint without validation. An attacker in a man-in-the-middle position between bbot and a Docker registry could modify this header to redirect the authentication request to an arbitrary endpoint, potentially leaking authentication tokens.
How severe is CVE-2026-12566?: CVE-2026-12566 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-12566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-12566?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-12566 have an EU (EUVD) identifier?: Yes. CVE-2026-12566 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37814.
When was CVE-2026-12566 published?: CVE-2026-12566 was published on 2026-06-17 and last updated on 2026-06-22.

References

https://github.com/blacklanternsecurity/bbot/commit/c2f4bc0f4

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