{"id":"CVE-2026-63184","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-63184","generatedAt":"2026-10-31T02:44:19.166Z","title":"Prior to 2.1.1, the `refitter` dotnet tool invokes `NJsonSchema` with unsafe defaults for `$ref` resolution when generating Refit interfaces and contracts from attacker-controlled or attacker-influenced OpenAPI descriptions.","description":"Refitter is a tool for generating a C# REST API client using the Refit library. Prior to 2.1.1, the `refitter` dotnet tool invokes `NJsonSchema` with unsafe defaults for `$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.","published":"2026-10-30T22:16:58.000Z","lastModified":"2026-10-30T22:16:58.000Z","status":"Received","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N"},"cwe":["CWE-829","CWE-918"],"affected":[],"epss":null,"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unscored. Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-30T22:16:58.000Z","detail":{"score":"7.1","severity":"HIGH","publishedAt":"2026-10-30T22:16:58.447Z"},"summary":"New CVE, high severity (CVSS 7.1)."}],"references":[{"url":"https://github.com/christianhelle/refitter/commit/6ad20a3803561225100b0a4bb6b12f947d23db7b","source":"security-advisories@github.com"},{"url":"https://github.com/christianhelle/refitter/pull/1173","source":"security-advisories@github.com"},{"url":"https://github.com/christianhelle/refitter/releases/tag/2.1.1","source":"security-advisories@github.com"},{"url":"https://github.com/christianhelle/refitter/security/advisories/GHSA-x6w4-f264-3vvr","source":"security-advisories@github.com"},{"url":"https://github.com/user-attachments/files/29395269/reproduce.sh","source":"security-advisories@github.com"},{"url":"https://github.com/user-attachments/files/29395271/maintainer-report.txt","source":"security-advisories@github.com"},{"url":"https://github.com/user-attachments/files/29395272/advisory.md","source":"security-advisories@github.com"},{"url":"https://github.com/user-attachments/files/29395283/reproduce.sh","source":"security-advisories@github.com"},{"url":"https://github.com/user-attachments/files/29395284/maintainer-report.txt","source":"security-advisories@github.com"},{"url":"https://github.com/user-attachments/files/29395285/advisory.md","source":"security-advisories@github.com"},{"url":"https://github.com/user-attachments/files/29395286/listener.py","source":"security-advisories@github.com"},{"url":"https://github.com/user-attachments/files/29395288/make_spec.py","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63184","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}