---
id: CVE-2026-73530
title: >-
  Flyto2 Core before 2.28.0 contains a server-side request forgery guard bypass
  vulnerability that allows attackers to reach internal services by supplying
  URLs using the unblocked IPv6 address `::` which the kernel routes to loopback
  iden…
summary: >-
  Flyto2 Core before 2.28.0 contains a server-side request forgery guard bypass
  vulnerability that allows attackers to reach internal services by supplying
  URLs using the unblocked IPv6 address `::` which the kernel routes to loopback
  iden…
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-918
published: '2026-08-13'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:35:08.537'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73530'
references:
  - url: 'https://github.com/flytohub/flyto-core/releases/tag/v2.28.0'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/flytohub/flyto-core/security/advisories/GHSA-gc4h-hj7x-gp5p
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/flyto2-core-ssrf-guard-bypass-via-is-private-ip
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/flytohub/flyto-core/security/advisories/GHSA-gc4h-hj7x-gp5p
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00397
epssPercentile: 0.33704
ingestedAt: '2026-09-09T21:22:45.534Z'
---

## Overview

Flyto2 Core before 2.28.0 contains a server-side request forgery guard bypass vulnerability that allows attackers to reach internal services by supplying URLs using the unblocked IPv6 address `::` which the kernel routes to loopback identically to `0.0.0.0`. Attackers can submit requests or trigger 302 redirects to ` to bypass the private IP range and blocked hostname checks in `is_private_ip()`, reaching services bound to IPv6 loopback across the `http.get`, `http.request`, and `http.batch` modules.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.