CVE-2026-73530 Flyto2 Core < 2.28.0 SSRF Guard Bypass via is_private_ip()
Attackers can bypass SSRF protections in Flyto2 Core to access internal IPv6 loopback services via crafted URLs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73530?
CVE-2026-73530 is a medium-severity server-side request forgery vulnerability in flytohub flyto-core, published on 13 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-73530?
How do I fix CVE-2026-73530?
No fix has been published for CVE-2026-73530 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-73530 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73530 exists.
Sources
Also known as GHSA-35jm-rm2f-hpgj, GHSA-gc4h-hj7x-gp5p.