What’s Vulnerable › Vulnerabilities

CVE-2026-73530: Flyto2 Core < 2.28.0 SSRF Guard Bypass via is_private_ip()

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-13 · updated 2026-09-09
• Weakness: CWE-918

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.

Affected products

• flytohub flyto-core: before 2.28.0 — fixed in 2.28.0

How to fix

Upgrade to a fixed version: flytohub flyto-core 2.28.0. Check the vendor advisory for mitigations.

References

• https://github.com/flytohub/flyto-core/releases/tag/v2.28.0
• https://github.com/flytohub/flyto-core/security/advisories/GHSA-gc4h-hj7x-gp5p
• https://www.vulncheck.com/advisories/flyto2-core-ssrf-guard-bypass-via-is-private-ip
• https://github.com/flytohub/flyto-core/security/advisories/GHSA-gc4h-hj7x-gp5p

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