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Starting in version 2.52.6 and prior to version 2.52.7, `fiber.Ctx.BodyParser` can map flat data to nested slices using `key[idx]value` syntax, but when idx is negative, it causes a …","description":"Fiber is an Express-inspired web framework written in Go. Starting in version 2.52.6 and prior to version 2.52.7, `fiber.Ctx.BodyParser` can map flat data to nested slices using `key[idx]value` syntax, but when idx is negative, it causes a panic instead of returning an error stating it cannot process the data. Since this data is user-provided, this could lead to denial of service for anyone relying on this `fiber.Ctx.BodyParser`  functionality. 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Starting in version 2.52.6 and prior to version 2.52.7, `fiber.Ctx.BodyParser` can map flat data to nested slices using `key[idx]value` syntax, but when idx is negative, it causes a panic instead of returning an error stating it cannot process the data. Since this data is user-provided, this could lead to denial of service for anyone relying on this `fiber.Ctx.BodyParser`  functionality. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2025-48075","identifiers":["CVE-2025-48075"]},"retained":false,"historicalAffected":[]},{"revision":"c6c8a52387b747289552575c17dd6e8f","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-hg3g-gphw-5hhm","aliases":["CVE-2025-48075","GO-2025-3706"],"title":"Fiber panics when fiber.Ctx.BodyParser parses invalid range index","description":"### Summary\nWhen using the `fiber.Ctx.BodyParser` to parse into a struct with range values, a panic occurs when trying to parse a negative range index\n\n### Details\n`fiber.Ctx.BodyParser` can map flat data to nested slices using `key[idx]value` syntax, however when idx is negative, it causes a panic instead of returning an error stating it cannot process the data. \n\nSince this data is user-provided, this could lead to denial of service for anyone relying on this `fiber.Ctx.BodyParser`  functionality  \n\n### Reproducing\nTake a simple GoFiberV2 server which returns a JSON encoded version of the FormData\n```go\npackage main\n\nimport (\n\t\"encoding/json\"\n\t\"fmt\"\n\t\"net/http\"\n\n\t\"github.com/gofiber/fiber/v2\"\n)\n\ntype RequestBody struct {\n\tNestedContent []*struct {\n\t\tValue string `form:\"value\"`\n\t} `form:\"nested-content\"`\n}\n\nfunc main() {\n\tapp := fiber.New()\n\n\tapp.Post(\"/\", func(c *fiber.Ctx) error {\n\t\tformData := RequestBody{}\n\t\tif err := c.BodyParser(&formData); err != nil {\n\t\t\tfmt.Println(err)\n\t\t\treturn c.SendStatus(http.StatusUnprocessableEntity)\n\t\t}\n                c.Set(\"Content-Type\", \"application/json\")\n                s, _ := json.Marshal(formData)\n                return c.SendString(string(s))\n\t})\n\n\tfmt.Println(app.Listen(\":3000\"))\n}\n\n```\n\n**Correct Behaviour**\nSend a valid request such as:\n```bash\ncurl --location 'localhost:3000' \\\n--form 'nested-content[0].value=\"Foo\"' \\\n--form 'nested-content[1].value=\"Bar\"'\n```\nYou recieve valid JSON\n```json\n{\"NestedContent\":[{\"Value\":\"Foo\"},{\"Value\":\"Bar\"}]}\n```\n\n**Crashing behaviour**\nSend an invalid request such as:\n```bash\ncurl --location 'localhost:3000' \\\n--form 'nested-content[-1].value=\"Foo\"'\n```\nThe server panics and crashes\n```\npanic: reflect: slice index out of range\n\ngoroutine 8 [running]:\nreflect.Value.Index({0x738000?, 0xc000010858?, 0x0?}, 0x738000?)\n        /usr/lib/go-1.24/src/reflect/value.go:1418 +0x167\ngithub.com/gofiber/fiber/v2/internal/schema.(*Decoder).decode(0xc00002c570, {0x75d420?, 0xc000010858?, 0x7ff424822108?}, {0xc00001c498, 0x17}, {0xc00014e2d0, 0x2, 0x2}, {0xc00002c710, ...})\n[...]\n```\n\n### Impact\nAnyone using `fiber.Ctx.BodyParser` can/will have their servers crashed when an invalid payload is sent","state":0,"publishedAt":"2025-05-22T20:08:31+00:00","modifiedAt":"2026-09-10T03:50:57.5515129+00:00","affected":[{"ecosystem":"Go","name":"github.com/gofiber/fiber/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.52.6"},{"kind":"fixed","version":"2.52.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/gofiber/fiber/security/advisories/GHSA-hg3g-gphw-5hhm","https://nvd.nist.gov/vuln/detail/CVE-2025-48075","https://github.com/gofiber/fiber/commit/e115c08b8f059a4a031b492aa9eef0712411853d","https://github.com/gofiber/fiber","https://pkg.go.dev/vuln/GO-2025-3706"],"sourceUrl":"https://github.com/advisories/GHSA-hg3g-gphw-5hhm","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-hg3g-gphw-5hhm","identifiers":["GHSA-hg3g-gphw-5hhm","CVE-2025-48075","GO-2025-3706"]},"retained":false,"historicalAffected":[]},{"revision":"ec202637291b4153b1cce32c24d9e742","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2025-3706","aliases":["CVE-2025-48075","GHSA-hg3g-gphw-5hhm"],"title":"Fiber panics when fiber.Ctx.BodyParser parses invalid range index in github.com/gofiber/fiber","description":"Fiber panics when fiber.Ctx.BodyParser parses invalid range index in github.com/gofiber/fiber","state":0,"publishedAt":"2025-05-27T20:47:04+00:00","modifiedAt":"2026-02-04T02:29:43.147229+00:00","affected":[{"ecosystem":"Go","name":"github.com/gofiber/fiber","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/gofiber/fiber/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.52.6"},{"kind":"fixed","version":"2.52.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/gofiber/fiber/security/advisories/GHSA-hg3g-gphw-5hhm","https://github.com/gofiber/fiber/commit/e115c08b8f059a4a031b492aa9eef0712411853d"],"sourceUrl":"https://osv.dev/vulnerability/GO-2025-3706","license":"OSV · upstream source license applies","key":"osv:GO-2025-3706","identifiers":["GO-2025-3706","CVE-2025-48075","GHSA-hg3g-gphw-5hhm"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; 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