CVE-2026-54589
Chartbrew: SSRF guard bypass via IPv6 NAT64/DNS64 addresses in API Data Connection outbound policy (validateOutboundUrl)
Chartbrew is an open-source web application that can connect directly to databases and APIs and use the data to create charts. Prior to 5.2.1, the outbound URL guard recognized ordinary IPv4, IPv6, and IPv4-mapped IPv6 destinations but did not recognize IPv4 addresses embedded in NAT64 prefixes. The vulnerable surface is aPI Data Connection outbound requests routed through server/modules/outboundTargetPolicy.js. An authenticated user with permission to create or edit an API connection supplies an attacker-controlled hostname or redirect whose DNS answer is a NAT64 address embedding a private or link-local IPv4 destination. The policy treated the NAT64 address as public; a NAT64 gateway then translated it to the embedded private IPv4 address after validation. The bypass requires a NAT64/DNS64 deployment path and connection-management privileges. IPv4-only deployments are not affected by this specific bypass. The attacker can read responses from 169.254.169.254 cloud metadata and arbitrary internal IPv4 hosts and ports reachable through the NAT64 gateway. This issue is fixed in version 5.2.1.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| chartbrew chartbrew |
< 5.2.1 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 7.0 high |
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:L | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/chartbrew/chartbrew/security/advisories/GHSA-6m7q-jmp7-3vw8CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/chartbrew/chartbrew/commit/8cfac8076bb0001b1571d93ef923698f53767751CNA: GitHub_M · x_refsource_MISC
- https://github.com/chartbrew/chartbrew/releases/tag/v5.2.1CNA: GitHub_M · x_refsource_MISC
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.