Refitter: Unrestricted OpenAPI references permit build-host SSRF and file inclusion
Summary
| CVE | CVE-2026-63184 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-30 22:16:58 UTC |
| Updated | 2026-10-30 22:16:58 UTC |
| Description | Refitter is a tool for generating a C# REST API client using the Refit library. Prior to 2.1.1, the `refitter` dotnet tool invokes `NJsonSchema` with unsafe defaults for `$ref` resolution when generating Refit interfaces and contracts from attacker-controlled or attacker-influenced OpenAPI descriptions. Remote `http(s)` references cause requests from the developer or CI host and inline untrusted remote schema content into generated output. Absolute local file paths and relative `../` traversal outside the input directory also resolve and inline local content, permitting arbitrary local-file disclosure. The demonstrated chain stops at server-side request forgery, remote file inclusion, and local file inclusion, not code execution: Refit sets the base URL at runtime, enum values use verbatim-string doubling, and string defaults are escaped. This issue is fixed in version 2.1.1. |
Risk And Classification
Primary CVSS: v3.1 7.1 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
EPSS: 0.004110000 probability, percentile 0.354030000 (date 2026-10-31)
Problem Types: CWE-829 | CWE-918 | CWE-829 CWE-829: Inclusion of Functionality from Untrusted Control Sphere | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 7.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N |
| 3.1 | CNA | DECLARED | 7.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
HighIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Christianhelle | Refitter | affected < 2.1.1 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/user-attachments/files/29395272/advisory.md | [email protected] | github.com | |
| github.com/user-attachments/files/29395286/listener.py | [email protected] | github.com | |
| github.com/christianhelle/refitter/pull/1173 | [email protected] | github.com | |
| github.com/user-attachments/files/29395288/make_spec.py | [email protected] | github.com | |
| github.com/christianhelle/refitter/releases/tag/2.1.1 | [email protected] | github.com | |
| github.com/user-attachments/files/29395271/maintainer-report.txt | [email protected] | github.com | |
| github.com/user-attachments/files/29395285/advisory.md | [email protected] | github.com | |
| github.com/christianhelle/refitter/security/advisories/GHSA-x6w4-f264-3vvr | [email protected] | github.com | |
| github.com/user-attachments/files/29395284/maintainer-report.txt | [email protected] | github.com | |
| github.com/user-attachments/files/29395269/reproduce.sh | [email protected] | github.com | |
| github.com/christianhelle/refitter/commit/6ad20a3803561225100b0a4bb6b12f... | [email protected] | github.com | |
| github.com/user-attachments/files/29395283/reproduce.sh | [email protected] | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.