{"id":"GHSA-j9v4-rhgr-4m5f","summary":"oRPC: Vary Header Injection in CORS Plugin leading to potential Cache/CORS Bypass","details":"### Summary\nA flaw in the CORS plugin allowed the incoming request's `Vary` header to be reflected into the response, letting a client influence a header that should be controlled solely by the server.\n\n### Details\nThe CORS plugin previously copied the request's `Vary` header directly onto the response instead of treating `Vary` as a response-only header. Because `Vary` tells downstream caches and proxies how to key their cached responses, this allowed a client to inject arbitrary values into the response's `Vary` header, potentially distorting cache-key behavior in shared caches/CDNs sitting in front of an oRPC server and leading to inconsistent CORS enforcement for other clients.\n\nPractical impact is limited to deployments where a shared cache or reverse proxy keys on the `Vary` header; the real-world effect depends on the caching layer's configuration.\n\n### Impact\nMay cause cache key pollution and inconsistent CORS enforcement in setups that rely on shared/edge caches keying on `Vary`. No direct confidentiality, integrity, or availability impact in default (non-cached) configurations.\n\n### Resolution\nUpdate `@orpc/server` (and any other `@orpc/*` packages bundling the CORS plugin) to `1.14.8`. The CORS plugin now derives `Vary` exclusively from the response, appending `Origin` and preserving existing values instead of reflecting request headers.","aliases":["CVE-2026-77360"],"modified":"2026-09-17T15:00:05.898138343Z","published":"2026-09-17T14:52:37Z","database_specific":{"nvd_published_at":"2026-09-16T19:17:38Z","cwe_ids":["CWE-113"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-09-17T14:52:37Z"},"references":[{"type":"WEB","url":"https://github.com/middleapi/orpc/security/advisories/GHSA-j9v4-rhgr-4m5f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77360"},{"type":"WEB","url":"https://github.com/middleapi/orpc/issues/1661"},{"type":"WEB","url":"https://github.com/middleapi/orpc/pull/1662"},{"type":"WEB","url":"https://github.com/middleapi/orpc/commit/daabded122a89d323357c4c401e879701864cb2f"},{"type":"PACKAGE","url":"https://github.com/middleapi/orpc"},{"type":"WEB","url":"https://github.com/middleapi/orpc/releases/tag/v1.14.8"}],"affected":[{"package":{"name":"@orpc/server","ecosystem":"npm","purl":"pkg:npm/%40orpc/server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.14.8"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 1.14.7","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-j9v4-rhgr-4m5f/GHSA-j9v4-rhgr-4m5f.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}