EUVD-2026-58242
GHSA-35jm-rm2f-hpgj
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
PR:L for required authenticated access; S:C and C:H capture SSRF reaching internal IPv6 loopback services beyond the application boundary; no integrity or availability impact confirmed.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Server-side request forgery guard bypass in Flyto Core (flyto-core) versions up to and including 2.27.0 allows authenticated low-privilege attackers to reach internal network services by supplying the IPv6 unspecified address ::, which the OS kernel routes to loopback identically to 0.0.0.0. The is_private_ip() guard function fails to classify :: or its expanded spellings as private, and the bypass is also reachable via attacker-controlled 302 redirects, meaning the attack surface spans the http.get, http.request, and http.batch modules. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires authenticated access with at least low-privilege credentials to the Flyto Core application, as reflected in CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.3 reflects a meaningful but not critical risk profile: the attack is network-accessible with low complexity and no required user interaction, but it does require authenticated low-privilege access (PR:L), which is the primary limiting factor. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with low-privilege authenticated access to a Flyto Core deployment submits an HTTP request to one of the `http.get`, `http.request`, or `http.batch` modules with a target URL of `http://[::]/admin` or a URL that redirects via a 302 to `http://[::]:<port>/`. Because `is_private_ip()` does not classify `::` as a private or loopback address, the guard passes the request, and the server-side HTTP client connects to the internal IPv6 loopback interface, returning the response of any service bound there - such as a local admin panel, metadata API, or internal microservice - directly to the attacker. … |
| Remediation | Upgrade flyto-core to version 2.28.0 immediately using `python -m pip install --upgrade flyto-core==2.28.0`, as confirmed by the vendor release at https://github.com/flytohub/flyto-core/releases/tag/v2.28.0 and the advisory at https://github.com/flytohub/flyto-core/security/advisories/GHSA-gc4h-hj7x-gp5p. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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