{"id":"CVE-2026-63346","aliases":[],"cve":{"records":[{"id":"CVE-2026-63346","source":"GitHub_M","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-07-16T14:14:24.385Z","published":"2026-10-30T22:17:02.231Z","modified":"2026-10-30T22:17:02.231Z"}],"publishers":[{"name":"GitHub_M","role":"CNA","organizationId":"a0819718-46f1-4df5-94e2-005712e83aaa","modified":"2026-10-30T22:17:02.231Z"}],"references":[{"url":"https://github.com/christianhelle/refitter/security/advisories/GHSA-58x9-vjvp-6mx8","tags":["x_refsource_CONFIRM"],"source":"GitHub_M"},{"url":"https://github.com/christianhelle/refitter/pull/1178","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/christianhelle/refitter/commit/63a19b03699a9c267d6fab5f758ec26484db83a1","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/christianhelle/refitter/releases/tag/2.1.2","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/user-attachments/files/29395048/maintainer-report.txt","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/user-attachments/files/29395050/make_spec.py","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/user-attachments/files/29395051/reproduce.sh","tags":["x_refsource_MISC"],"source":"GitHub_M"}],"weaknesses":[{"id":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","source":"GitHub_M"},{"id":"CWE-116","description":"CWE-116: Improper Encoding or Escaping of Output","source":"GitHub_M"}],"applicability":[],"prioritization":[]},"title":"Refitter: C# source injection through OpenAPI header parameter names","titleSource":"GitHub_M","descriptionSource":"GitHub_M","description":"Refitter is a tool for generating a C# REST API client using the Refit library. Prior to 2.1.2, the header parameter name in `parameters[].name` with `in: header` is emitted verbatim into a Refit `[Header(\"<name>\")]` attribute string without escaping quotation marks. An attacker-influenced OpenAPI description can pass default validation without `--skip-validation` and break out from the parameter-list position by closing the parameter and method syntax, attribute, interface, and namespace. The generated file can remain valid C# while containing a top-level file class with a `[ModuleInitializer]` method, which executes attacker code when the compiled assembly is loaded at application startup, even if the client is never called. Query `AliasAs` and enum/default value sinks are escaped; this flaw is in header-name attribute-string emission. The behavior was verified with Refitter 2.0.0 and .NET 8. This issue is fixed in version 2.1.2.","score":8.6,"severity":"high","published":"2026-10-30T22:17:02.231Z","modified":"2026-10-30T22:17:02.231Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"christianhelle","name":"refitter","platforms":[],"versions":[{"version":"< 2.1.2","status":"affected"}],"cpes":[],"source":"GitHub_M","url":"https://www.cve.org/CVERecord?id=CVE-2026-63346"}],"remediation":[],"references":["https://github.com/christianhelle/refitter/security/advisories/GHSA-58x9-vjvp-6mx8","https://github.com/christianhelle/refitter/pull/1178","https://github.com/christianhelle/refitter/commit/63a19b03699a9c267d6fab5f758ec26484db83a1","https://github.com/christianhelle/refitter/releases/tag/2.1.2","https://github.com/user-attachments/files/29395048/maintainer-report.txt","https://github.com/user-attachments/files/29395050/make_spec.py","https://github.com/user-attachments/files/29395051/reproduce.sh"],"sources":[{"name":"CVE","id":"CVE-2026-63346","modified":"2026-10-30T22:17:02.231Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-63346"}],"assessments":[{"source":"GitHub_M","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.6}],"sourceAffected":[],"observedAt":"2026-10-30T22:47:39.667Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T10:20:31.211Z"},"coverage":[{"source":"NVD","status":"no-result","checkedAt":"2026-10-30T23:00:40.475Z","attemptedAt":"2026-10-30T23:00:40.475Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-10-30T23:00:42.025Z","attemptedAt":"2026-10-30T23:00:42.025Z"},{"source":"EUVD","status":"no-result","checkedAt":"2026-10-30T23:00:41.150Z","attemptedAt":"2026-10-30T23:00:41.150Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-30T23:00:41.892Z","attemptedAt":"2026-10-30T23:00:41.892Z"}],"evidence":[],"aiSummary":null}