{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63346", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-16T14:14:24.385Z", "datePublished": "2026-10-30T22:17:02.231Z", "dateUpdated": "2026-10-30T22:17:02.231Z"}, "containers": {"cna": {"title": "Refitter: C# source injection through OpenAPI header parameter names", "problemTypes": [{"descriptions": [{"cweId": "CWE-94", "lang": "en", "description": "CWE-94: Improper Control of Generation of Code ('Code Injection')", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-116", "lang": "en", "description": "CWE-116: Improper Encoding or Escaping of Output", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.6, "baseSeverity": "HIGH", "vectorString": "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", "version": "4.0"}}], "references": [{"name": "https://github.com/christianhelle/refitter/security/advisories/GHSA-58x9-vjvp-6mx8", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/christianhelle/refitter/security/advisories/GHSA-58x9-vjvp-6mx8"}, {"name": "https://github.com/christianhelle/refitter/pull/1178", "tags": ["x_refsource_MISC"], "url": "https://github.com/christianhelle/refitter/pull/1178"}, {"name": "https://github.com/christianhelle/refitter/commit/63a19b03699a9c267d6fab5f758ec26484db83a1", "tags": ["x_refsource_MISC"], "url": "https://github.com/christianhelle/refitter/commit/63a19b03699a9c267d6fab5f758ec26484db83a1"}, {"name": "https://github.com/christianhelle/refitter/releases/tag/2.1.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/christianhelle/refitter/releases/tag/2.1.2"}, {"name": "https://github.com/user-attachments/files/29395048/maintainer-report.txt", "tags": ["x_refsource_MISC"], "url": "https://github.com/user-attachments/files/29395048/maintainer-report.txt"}, {"name": "https://github.com/user-attachments/files/29395050/make_spec.py", "tags": ["x_refsource_MISC"], "url": "https://github.com/user-attachments/files/29395050/make_spec.py"}, {"name": "https://github.com/user-attachments/files/29395051/reproduce.sh", "tags": ["x_refsource_MISC"], "url": "https://github.com/user-attachments/files/29395051/reproduce.sh"}], "affected": [{"vendor": "christianhelle", "product": "refitter", "versions": [{"version": "< 2.1.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-30T22:17:02.231Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-58x9-vjvp-6mx8", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "refitter", "vendor": "christianhelle", "versions": [{"status": "affected", "version": "< 2.1.2"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-63346", "lastModified": "2026-10-30T23:17:14.130", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-10-30T23:17:14.130", "references": [{"source": "[email protected]", "url": "https://github.com/christianhelle/refitter/commit/63a19b03699a9c267d6fab5f758ec26484db83a1"}, {"source": "[email protected]", "url": "https://github.com/christianhelle/refitter/pull/1178"}, {"source": "[email protected]", "url": "https://github.com/christianhelle/refitter/releases/tag/2.1.2"}, {"source": "[email protected]", "url": "https://github.com/christianhelle/refitter/security/advisories/GHSA-58x9-vjvp-6mx8"}, {"source": "[email protected]", "url": "https://github.com/user-attachments/files/29395048/maintainer-report.txt"}, {"source": "[email protected]", "url": "https://github.com/user-attachments/files/29395050/make_spec.py"}, {"source": "[email protected]", "url": "https://github.com/user-attachments/files/29395051/reproduce.sh"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}, {"lang": "en", "value": "CWE-116"}], "source": "[email protected]", "type": "Primary"}]}

{}

{"created": "2026-10-30T23:30:15.706826+00:00", "updated": "2026-10-30T23:30:15.706831+00:00", "vendors": []}