PatchSiren cyber security CVE debrief

CVE-2026-12566 Black Lantern Security CVE debrief

CVE-2026-12566 is a vulnerability in the docker_pull module of Black Lantern Security's BBOT tool, allowing an attacker in a man-in-the-middle position to redirect authentication requests to an arbitrary endpoint, potentially leaking authentication tokens. This issue arises from the module's lack of validation for the realm parameter in the WWW-Authenticate response header from a Docker registry. The vulnerability has a CVSS score of 3.1 and is considered Low severity. Affected users should be aware of this vulnerability and take steps to mitigate it by validating the realm parameter, implementing proper authentication mechanisms, and monitoring for suspicious activity. The CVE record was published on 2026-06-17T23:17:03.100Z and has not been modified since then. The NVD entry is currently Deferred.

Vendor: Black Lantern Security
Product: BBOT
CVSS: LOW 3.1
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-17
Original CVE updated: 2026-06-22
Advisory published: 2026-06-17
Advisory updated: 2026-06-22

Who should care

Users of Black Lantern Security's BBOT tool who interact with Docker registries should be aware of this vulnerability and take steps to mitigate it by validating the realm parameter, implementing proper authentication mechanisms, and monitoring for suspicious activity. This includes operators, platform administrators, vulnerability management teams, and security teams who may be impacted by the potential leakage of authentication tokens.

Technical summary

The docker_pull module in BBOT does not validate the realm parameter from a Docker registry's WWW-Authenticate response header. This parameter is used as the authentication endpoint. An attacker in a man-in-the-middle position can modify this header to redirect the authentication request to an arbitrary endpoint. This could lead to the leakage of authentication tokens. Affected users should review their deployments, verify the official advisory, and plan updates or mitigations accordingly.

Defensive priority

High

Recommended defensive actions

Validate the realm parameter from Docker registry's WWW-Authenticate response header
Implement proper authentication and authorization mechanisms
Monitor for suspicious activity
Update BBOT tool to the latest version
Review compensating controls for exposed systems while remediation is scheduled and verified
Check relevant monitoring, detection, and logs for exposed assets that need extra review
Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-06-17T23:17:03.100Z and was last modified on 2026-06-22T17:45:43.473Z. The NVD entry is currently Deferred. The docker_pull module in BBOT uses the realm parameter from a Docker registry's WWW-Authenticate response header as the authentication endpoint without validation, allowing potential authentication token leakage. Users should verify affected deployments, review official advisories, and plan updates or mitigations. Evidence is limited, and defenders should verify the official advisory and review their deployments for potential exposure.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-06-17T23:17:03.100Z and has not been modified since then. The NVD entry is currently Deferred.