Refitter is a tool for generating a C# REST API client using the Refit library. Prior to 2.1.2, content-type keys in the content maps of `requestBody/responses` are emitted verbatim into a Refit `[Headers("Accept: <ct>", "Content-Type: <ct>")]` attribute string without escaping quotation marks. A crafted content-type key in an attacker-influenced OpenAPI description survives default validation without `--skip-validation`, breaks out of the attribute string and enclosing interface and namespace, and can introduce a top-level file class while leaving valid generated C#. A `[ModuleInitializer]` method in that class executes attacker code when the generated assembly is loaded at application startup, without requiring a call to the client. The behavior was verified with Refitter 2.0.0 and .NET 8. This issue is fixed in version 2.1.2.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 8.6 · christianhelleNVD modified 2026-10-30 22:15
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 7
- https://github.com/christianhelle/refitter/security/advisories/GHSA-p32v-8v8j-j534 x_refsource_confirm
- https://github.com/christianhelle/refitter/pull/1178 x_refsource_misc
- https://github.com/christianhelle/refitter/commit/ab4d8e439d6f0ee82ad49ee15323978d70fe5a67 x_refsource_misc
- https://github.com/christianhelle/refitter/releases/tag/2.1.2 x_refsource_misc
- https://github.com/user-attachments/files/29394848/reproduce.sh x_refsource_misc
- https://github.com/user-attachments/files/29394851/maintainer-report.txt x_refsource_misc
- https://github.com/user-attachments/files/29394853/make_spec.py x_refsource_misc