CVE-2026-63184— Refitter: Unrestricted OpenAPI references permit build-host SSRF and file inclusion

Quick assessment

Affected

christianhelle refitter

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Refitter 是一款利用 Refit 库生成 CREST API 客户端的工具。在 2.1.1 版本之前，命令行工具在从攻击者控制或受攻击者影响的 OpenAPI 描述文件生成 Refit 接口和契约时，会调用并启用针对解析的不安全默认配置。具体风险如下：远程引用会导致开发者或持续集成（CI）主机发起请求，并将不受信任的远程 Schema 内容内联到生成的输出文件中；绝对本地文件路径以及用于向上遍历的相对路径（如）同样会被解析并内联，从而允许泄露任意本地文件内容。该漏洞的攻击链已证实可导致服务

CVSS 7.1 · High Updated Oct 31, 2026

Possible ATT&CK Techniques 2 AI

T1583.006 · Web Services T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Refitter: Unrestricted OpenAPI references permit build-host SSRF and file inclusion

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

从非可信控制范围包含功能例程

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
christianhelle	refitter	< 2.1.1	-

II. Public POCs for CVE-2026-63184

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-63184

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Other References for CVE-2026-63184 (12)

https://github.com/christianhelle/refitter/pull/1173 x_refsource_MISC
https://github.com/christianhelle/refitter/releases/tag/2.1.1 x_refsource_MISC
https://github.com/user-attachments/files/29395272/advisory.md x_refsource_MISC
https://github.com/user-attachments/files/29395286/listener.py x_refsource_MISC
https://github.com/user-attachments/files/29395285/advisory.md x_refsource_MISC
https://github.com/user-attachments/files/29395288/make_spec.py x_refsource_MISC
https://github.com/user-attachments/files/29395283/reproduce.sh x_refsource_MISC
https://github.com/user-attachments/files/29395269/reproduce.sh x_refsource_MISC
https://github.com/user-attachments/files/29395271/maintainer-report.txt x_refsource_MISC
https://github.com/user-attachments/files/29395284/maintainer-report.txt x_refsource_MISC
https://github.com/christianhelle/refitter/security/advisories/GHSA-x6w4-f264-3vvr x_refsource_CONFIRM
https://github.com/christianhelle/refitter/commit/6ad20a3803561225100b0a4bb6b12f947d23db7b x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-63184

Same Patch Batch · christianhelle · 2026-10-30 · 4 CVEs total

CVE-2026-63345	8.6 HIGH	Refitter: C# source injection through OpenAPI path keys
CVE-2026-63344	8.6 HIGH	Refitter: C# source injection through OpenAPI content-type map keys
CVE-2026-63346	8.6 HIGH	Refitter: C# source injection through OpenAPI header parameter names

IV. Related Vulnerabilities

Same product: refitter

Same vendor: christianhelle

Same weakness: CWE-829