CVE-2026-63184
highRefitter is a tool for generating a C# REST API client using the Refit library.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/christianhelle/refitter/commit/6ad20a3803561225100b0a4bb6b12f947d23db7b security-advisories@github.com
- https://github.com/christianhelle/refitter/pull/1173 security-advisories@github.com
- https://github.com/christianhelle/refitter/releases/tag/2.1.1 security-advisories@github.com
- https://github.com/christianhelle/refitter/security/advisories/GHSA-x6w4-f264-3vvr security-advisories@github.com
- https://github.com/user-attachments/files/29395269/reproduce.sh security-advisories@github.com
- https://github.com/user-attachments/files/29395271/maintainer-report.txt security-advisories@github.com
- https://github.com/user-attachments/files/29395272/advisory.md security-advisories@github.com
- https://github.com/user-attachments/files/29395283/reproduce.sh security-advisories@github.com
- https://github.com/user-attachments/files/29395284/maintainer-report.txt security-advisories@github.com
- https://github.com/user-attachments/files/29395285/advisory.md security-advisories@github.com
- https://github.com/user-attachments/files/29395286/listener.py security-advisories@github.com
- https://github.com/user-attachments/files/29395288/make_spec.py security-advisories@github.com