| { |
| "schema_version": "1.3.1", |
| "id": "GO-2026-4950", |
| "modified": "0001-01-01T00:00:00Z", |
| "published": "0001-01-01T00:00:00Z", |
| "summary": "Authorization bypass via double-encoded paths in github.com/valyala/fasthttp", |
| "details": "In github.com/valyala/fasthttp before 1.70.0, ServeFile and ServeFS reinterpret filesystem paths as URIs, decoding percent-encoded sequences and treating characters like '?' and '#' as URI delimiters. In applications where authorization guards inspect ctx.Path() before passing paths to file-serving handlers, double-encoded path variants (e.g., /%2561dmin/export.csv) bypass access controls while still resolving to the protected file on disk.", |
| "affected": [ |
| { |
| "package": { |
| "name": "github.com/valyala/fasthttp", |
| "ecosystem": "Go" |
| }, |
| "ranges": [ |
| { |
| "type": "SEMVER", |
| "events": [ |
| { |
| "introduced": "0" |
| }, |
| { |
| "fixed": "1.70.0" |
| } |
| ] |
| } |
| ], |
| "ecosystem_specific": { |
| "imports": [ |
| { |
| "path": "github.com/valyala/fasthttp", |
| "symbols": [ |
| "RequestCtx.SendFile", |
| "RequestCtx.SendFileBytes", |
| "ServeFS", |
| "ServeFile", |
| "ServeFileBytes", |
| "ServeFileBytesUncompressed", |
| "ServeFileUncompressed" |
| ] |
| } |
| ] |
| } |
| } |
| ], |
| "references": [ |
| { |
| "type": "REPORT", |
| "url": "https://github.com/golang/vulndb/issues/4950" |
| }, |
| { |
| "type": "FIX", |
| "url": "https://github.com/valyala/fasthttp/pull/2163" |
| }, |
| { |
| "type": "WEB", |
| "url": "https://gist.github.com/thesmartshadow/af53acdfe0d6ce352d14eb86cecf5a08" |
| }, |
| { |
| "type": "WEB", |
| "url": "https://github.com/valyala/fasthttp/releases/tag/v1.70.0" |
| } |
| ], |
| "credits": [ |
| { |
| "name": "Ali Firas (thesmartshadow)" |
| } |
| ], |
| "database_specific": { |
| "url": "https://pkg.go.dev/vuln/GO-2026-4950", |
| "review_status": "REVIEWED" |
| } |
| } |
