SSRF in Flytohub Flyto-Core
CVE-2026-73530
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (34.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Flytohub Flyto-Core — versions 0
Weakness classification (CWE)
References
- github.com/flytohub/flyto-core/security/advisories/GHSA-gc4h-hj7x-gp5p (vendor-advisory)
- github.com/flytohub/flyto-core/releases/tag/v2.28.0 (release-notes)
- www.vulncheck.com/advisories/flyto2-core-ssrf-guard-bypass-via-is-private-ip (third-party-advisory)
Frequently asked questions
- What is CVE-2026-73530?
- CVE-2026-73530 is a high-severity vulnerability in Flytohub Flyto-Core, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-08-13.
- How severe is CVE-2026-73530?
- High severity. CVSS v3 base score is 7.7 out of 10.