# CVE-2026-54589: Chartbrew NAT64/DNS64 SSRF bypass in outbound policy

Source: https://junglewise.ai/threats/cve-2026-54589-chartbrew-is-an-open-source-web-application-that-can-connect  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-06. Updated: 2026-11-06  
License: CC BY 4.0 with a link back

CVE-2026-54589 · Severity: info · Published 2026-11-06

Chartbrew is an open-source analytics tool that connects to databases and APIs to generate charts. An authenticated user with API connection privileges can bypass security checks by supplying a NAT64-addressed hostname, allowing them to reach internal cloud metadata services and private network hosts that should be blocked. This vulnerability only affects systems using IPv6 with NAT64/DNS64 translation.

Technologies: [Chartbrew](https://junglewise.ai/threats/technologies/chartbrew-chartbrew). Vendors: [Chartbrew](https://junglewise.ai/threats/vendors/chartbrew).

## Quick answers

**Is CVE-2026-54589 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54589 being exploited in the wild.

**How severe is CVE-2026-54589?** Informational severity, published 6 November 2026.

**Which products and versions are affected?** Chartbrew before 5.2.1.

**Is there a fix for CVE-2026-54589?** Yes: fixed in 5.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-54589 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-54589?** Check whether you run Chartbrew at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 5.2.1

## Technical details

The outbound URL guard in server/modules/outboundTargetPolicy.js failed to recognize IPv4 addresses embedded within NAT64 prefixes (64:ff9b::/96 and 64:ff9b:1::/48), treating them as public IPv6 addresses. An authenticated attacker with API connection creation/edit permissions can supply a malicious hostname whose DNS response resolves to a NAT64-embedded private IPv4 address; the gateway then translates it post-validation, enabling SSRF access to cloud metadata (169.254.169.254) and internal RFC 1918 hosts. The attack requires a NAT64/DNS64 deployment and is fixed in version 5.2.1 by registering NAT64 prefixes in the blocklist and extracting embedded IPv4s for validation.

## Affected products

- Chartbrew Chartbrew before 5.2.1

## Timeline

- 2026-11-06: disclosed
- 2026-06-14: patched

## References

- [https://github.com/chartbrew/chartbrew/commit/8cfac8076bb0001b1571d93ef923698f53767751](https://github.com/chartbrew/chartbrew/commit/8cfac8076bb0001b1571d93ef923698f53767751)
- [https://github.com/chartbrew/chartbrew/releases/tag/v5.2.1](https://github.com/chartbrew/chartbrew/releases/tag/v5.2.1)

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