{"id":"CVE-2026-63344","published":"2026-10-30T23:17:13.840","lastModified":"2026-10-30T23:17:13.840","description":"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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-94","CWE-116"],"vendors":[],"products":[],"references":[{"url":"https://github.com/christianhelle/refitter/commit/ab4d8e439d6f0ee82ad49ee15323978d70fe5a67","tags":[]},{"url":"https://github.com/christianhelle/refitter/pull/1178","tags":[]},{"url":"https://github.com/christianhelle/refitter/releases/tag/2.1.2","tags":[]},{"url":"https://github.com/christianhelle/refitter/security/advisories/GHSA-p32v-8v8j-j534","tags":[]},{"url":"https://github.com/user-attachments/files/29394848/reproduce.sh","tags":[]},{"url":"https://github.com/user-attachments/files/29394851/maintainer-report.txt","tags":[]},{"url":"https://github.com/user-attachments/files/29394853/make_spec.py","tags":[]}],"exploitRefs":[{"url":"https://github.com/christianhelle/refitter/commit/ab4d8e439d6f0ee82ad49ee15323978d70fe5a67","tags":[]},{"url":"https://github.com/christianhelle/refitter/pull/1178","tags":[]},{"url":"https://github.com/christianhelle/refitter/releases/tag/2.1.2","tags":[]},{"url":"https://github.com/christianhelle/refitter/security/advisories/GHSA-p32v-8v8j-j534","tags":[]},{"url":"https://github.com/user-attachments/files/29394848/reproduce.sh","tags":[]},{"url":"https://github.com/user-attachments/files/29394851/maintainer-report.txt","tags":[]},{"url":"https://github.com/user-attachments/files/29394853/make_spec.py","tags":[]}],"hasPoc":true,"ai":null}