{"id":"CVE-2025-54801","aliases":["EUVD-2025-23668","GHSA-qx2q-88mx-vhg7","GO-2025-3845","SUSE-SU-2025:02912-1","openSUSE-SU-2025:15434-1"],"status":"published","title":"Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder","description":"Fiber is an Express inspired web framework written in Go. In versions 2.52.8 and below, when using Fiber's Ctx.BodyParser to parse form data containing a large numeric key that represents a slice index (e.g., test.18446744073704), the application crashes due to an out-of-bounds slice allocation in the underlying schema decoder. The root cause is that the decoder attempts to allocate a slice of length idx + 1 without validating whether the index is within a safe or reasonable range. If the idx is excessively large, this leads to an integer overflow or memory exhaustion, causing a panic or crash. This is fixed in version 2.52.9.","severity":{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00424,"percentile":0.36994,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-789"],"published":"2025-08-05T15:22:21Z","modified":"2026-10-28T02:30:39Z","fixes":[{"ecosystem":"Go","package":"github.com/gofiber/fiber/v2","fixed_in":["2.52.9"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/gofiber/fiber/v2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.52.8"},{"fixed":"2.52.9"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/gofiber/fiber/v2","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.52.9"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/gofiber/fiber/v2","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.52.9"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Package Hub 15 SP6","package":"govulncheck-vulndb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.20250814T182633-150000.1.98.1"}]}],"bundled":31},{"source":"osv","ecosystem":"openSUSE:Leap 15.6","package":"govulncheck-vulndb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.20250814T182633-150000.1.98.1"}]}],"bundled":31},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"govulncheck-vulndb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.20250811T192933-1.1"}]}],"bundled":29}],"products":[{"vendor":"gofiber","product":"fiber"}],"references":[{"url":"https://github.com/gofiber/fiber/security/advisories/GHSA-qx2q-88mx-vhg7","tags":["x_refsource_CONFIRM","exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/gofiber/fiber/commit/e115c08b8f059a4a031b492aa9eef0712411853d","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-54801","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-qx2q-88mx-vhg7"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/54xxx/CVE-2025-54801.json","tags":["advisory"]},{"url":"https://github.com/gofiber/fiber","tags":["package"]},{"url":"https://www.suse.com/support/update/announcement/2025/suse-su-202502912-1/","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2021-21411","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-44906","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-44779","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-47907","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-50738","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-53534","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-53942","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54386","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54388","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54410","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54424","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54576","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54799","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54801","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54996","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54997","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54998","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54999","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-55000","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-55001","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-55003","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-5999","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-6000","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-6004","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-6011","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-6013","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-6014","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-6015","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-6037","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-7195","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-8341","tags":["web"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-54801","title":"Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder","description":"Fiber is an Express inspired web framework written in Go. In versions 2.52.8 and below, when using Fiber's Ctx.BodyParser to parse form data containing a large numeric key that represents a slice index (e.g., test.18446744073704), the application crashes due to an out-of-bounds slice allocation in the underlying schema decoder. The root cause is that the decoder attempts to allocate a slice of length idx + 1 without validating whether the index is within a safe or reasonable range. If the idx is excessively large, this leads to an integer overflow or memory exhaustion, causing a panic or crash. This is fixed in version 2.52.9.","status":"published","published":"2025-08-05T23:33:28.221Z","modified":"2025-08-07T14:00:09.981Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T14:32:27.603809Z"}],"euvd":[{"id":"EUVD-2025-23668","description":"Fiber is an Express inspired web framework written in Go. In versions 2.52.8 and below, when using Fiber's Ctx.BodyParser to parse form data containing a large numeric key that represents a slice index (e.g., test.18446744073704), the application crashes due to an out-of-bounds slice allocation in the underlying schema decoder. The root cause is that the decoder attempts to allocate a slice of length idx + 1 without validating whether the index is within a safe or reasonable range. If the idx is excessively large, this leads to an integer overflow or memory exhaustion, causing a panic or crash. This is fixed in version 2.52.9.","status":"published","published":"2025-08-05T23:33:28Z","modified":"2025-08-07T14:00:09Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T20:32:00.279926Z"}],"ghsa":[{"id":"GHSA-qx2q-88mx-vhg7","title":"Fiber Crashes in BodyParser Due to Unvalidated Large Slice Index in Decoder","description":"### Description\n\nWhen using Fiber's `Ctx.BodyParser` to parse form data containing a large numeric key that represents a slice index (e.g., `test.18446744073704`), the application crashes due to an out-of-bounds slice allocation in the underlying schema decoder.\n\nThe root cause is that the decoder attempts to allocate a slice of length `idx + 1` without validating whether the index is within a safe or reasonable range. If `idx` is excessively large, this leads to an integer overflow or memory exhaustion, causing a panic or crash.\n\n\n### Steps to Reproduce\n\nCreate a POST request handler that accepts `x-www-form-urlencoded` data\n\n```go\npackage main\n\nimport (\n\t\"fmt\"\n\t\"net/http\"\n\n\t\"github.com/gofiber/fiber/v2\"\n)\n\ntype RequestBody struct {\n\tNestedContent []*struct{} `form:\"test\"`\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(\u0026formData); err != nil {\n\t\t\tfmt.Println(err)\n\t\t\treturn c.SendStatus(http.StatusUnprocessableEntity)\n\t\t}\n\t\treturn nil\n\t})\n\n\tfmt.Println(app.Listen(\":3000\"))\n}\n\n```\n\nRun the server and send a POST request with a large numeric key in form data, such as:\n\n```bash\ncurl -v -X POST localhost:3000 --data-raw 'test.18446744073704' \\\n  -H 'Content-Type: application/x-www-form-urlencoded'\n```\n\n\n### Relevant Code Snippet\n\nWithin the decoder's [decode method](https://github.com/gofiber/fiber/blob/v2.52.8/internal/schema/decoder.go#L249):\n\n```go\nidx := parts[0].index\nif v.IsNil() || v.Len() \u003c idx+1 {\n    value := reflect.MakeSlice(t, idx+1, idx+1)  // \u003c-- Panic/crash occurs here when idx is huge\n    if v.Len() \u003c idx+1 {\n        reflect.Copy(value, v)\n    }\n    v.Set(value)\n}\n```\n\nThe `idx` is not validated before use, leading to unsafe slice allocation for extremely large values.\n\n---\n\n### Impact\n\n- Application panic or crash on malicious or malformed input.\n- Potential denial of service (DoS) via memory exhaustion or server crash.\n- Lack of defensive checks in the parsing code causes instability.","status":"published","published":"2025-08-05T15:22:21Z","modified":"2025-08-06T14:31:41Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T14:38:52.85141Z"}],"nvd":[{"id":"CVE-2025-54801","description":"Fiber is an Express inspired web framework written in Go. In versions 2.52.8 and below, when using Fiber's Ctx.BodyParser to parse form data containing a large numeric key that represents a slice index (e.g., test.18446744073704), the application crashes due to an out-of-bounds slice allocation in the underlying schema decoder. The root cause is that the decoder attempts to allocate a slice of length idx + 1 without validating whether the index is within a safe or reasonable range. If the idx is excessively large, this leads to an integer overflow or memory exhaustion, causing a panic or crash. This is fixed in version 2.52.9.","status":"published","published":"2025-08-06T00:15:31.033Z","modified":"2026-06-17T09:40:43.787Z","cvss":[{"version":"4.0","score":8.7,"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: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","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T14:11:22.319351Z"}],"osv":[{"id":"CVE-2025-54801","title":"Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder","description":"Fiber is an Express inspired web framework written in Go. In versions 2.52.8 and below, when using Fiber's Ctx.BodyParser to parse form data containing a large numeric key that represents a slice index (e.g., test.18446744073704), the application crashes due to an out-of-bounds slice allocation in the underlying schema decoder. The root cause is that the decoder attempts to allocate a slice of length idx + 1 without validating whether the index is within a safe or reasonable range. If the idx is excessively large, this leads to an integer overflow or memory exhaustion, causing a panic or crash. This is fixed in version 2.52.9.","status":"published","published":"2025-08-05T23:33:28.221Z","modified":"2026-10-28T02:30:39.85215137Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T15:44:50.863921Z"},{"id":"GHSA-qx2q-88mx-vhg7","title":"Fiber Crashes in BodyParser Due to Unvalidated Large Slice Index in Decoder","description":"### Description\n\nWhen using Fiber's `Ctx.BodyParser` to parse form data containing a large numeric key that represents a slice index (e.g., `test.18446744073704`), the application crashes due to an out-of-bounds slice allocation in the underlying schema decoder.\n\nThe root cause is that the decoder attempts to allocate a slice of length `idx + 1` without validating whether the index is within a safe or reasonable range. If `idx` is excessively large, this leads to an integer overflow or memory exhaustion, causing a panic or crash.\n\n\n### Steps to Reproduce\n\nCreate a POST request handler that accepts `x-www-form-urlencoded` data\n\n```go\npackage main\n\nimport (\n\t\"fmt\"\n\t\"net/http\"\n\n\t\"github.com/gofiber/fiber/v2\"\n)\n\ntype RequestBody struct {\n\tNestedContent []*struct{} `form:\"test\"`\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(\u0026formData); err != nil {\n\t\t\tfmt.Println(err)\n\t\t\treturn c.SendStatus(http.StatusUnprocessableEntity)\n\t\t}\n\t\treturn nil\n\t})\n\n\tfmt.Println(app.Listen(\":3000\"))\n}\n\n```\n\nRun the server and send a POST request with a large numeric key in form data, such as:\n\n```bash\ncurl -v -X POST localhost:3000 --data-raw 'test.18446744073704' \\\n  -H 'Content-Type: application/x-www-form-urlencoded'\n```\n\n\n### Relevant Code Snippet\n\nWithin the decoder's [decode method](https://github.com/gofiber/fiber/blob/v2.52.8/internal/schema/decoder.go#L249):\n\n```go\nidx := parts[0].index\nif v.IsNil() || v.Len() \u003c idx+1 {\n    value := reflect.MakeSlice(t, idx+1, idx+1)  // \u003c-- Panic/crash occurs here when idx is huge\n    if v.Len() \u003c idx+1 {\n        reflect.Copy(value, v)\n    }\n    v.Set(value)\n}\n```\n\nThe `idx` is not validated before use, leading to unsafe slice allocation for extremely large values.\n\n---\n\n### Impact\n\n- Application panic or crash on malicious or malformed input.\n- Potential denial of service (DoS) via memory exhaustion or server crash.\n- Lack of defensive checks in the parsing code causes instability.","status":"published","published":"2025-08-05T15:22:21Z","modified":"2026-09-10T03:50:27.479656573Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T15:46:55.122811Z"},{"id":"GO-2025-3845","title":"Fiber Crashes in BodyParser Due to Unvalidated Large Slice Index in Decoder in github.com/gofiber/fiber","description":"Fiber Crashes in BodyParser Due to Unvalidated Large Slice Index in Decoder in github.com/gofiber/fiber","status":"published","published":"2025-08-11T17:25:05Z","modified":"2026-02-04T02:57:36.768757Z","updated_at":"2026-11-02T15:47:01.728182Z"},{"id":"openSUSE-SU-2025:15434-1","title":"govulncheck-vulndb-0.0.20250811T192933-1.1 on GA media","description":"These are all security issues fixed in the govulncheck-vulndb-0.0.20250811T192933-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2025-08-12T00:00:00Z","modified":"2026-03-23T04:53:46.634804Z","updated_at":"2026-11-02T16:58:37.810934Z"},{"id":"SUSE-SU-2025:02912-1","title":"Security update for govulncheck-vulndb","description":"This update for govulncheck-vulndb fixes the following issues:\n\n- Update to version 0.0.20250814T182633 2025-08-14T18:26:33Z (jsc#PED-11136)\n\n  Go CVE Numbering Authority IDs added or updated with aliases:\n  * GO-2025-3765 CVE-2024-44906 GHSA-h4h6-vccr-44h2\n  * GO-2025-3829 CVE-2025-54410 GHSA-4vq8-7jfc-9cvp\n\n- Update to version 0.0.20250811T192933 2025-08-11T19:29:33Z (jsc#PED-11136)\n  \n  Go CVE Numbering Authority IDs added or updated with aliases:\n  * GO-2025-3822 CVE-2025-53942 GHSA-9g4j-v8w5-7x42\n  * GO-2025-3829 CVE-2025-54410 GHSA-4vq8-7jfc-9cvp\n  * GO-2025-3830 CVE-2025-54388 GHSA-x4rx-4gw3-53p4\n  * GO-2025-3831 CVE-2025-50738 GHSA-hfcf-79gh-f3jc\n  * GO-2025-3832 CVE-2021-21411 GHSA-652x-m2gr-hppm\n  * GO-2025-3833 CVE-2025-54576 GHSA-7rh7-c77v-6434\n  * GO-2025-3834 CVE-2025-54424 GHSA-8j63-96wh-wh3j\n  * GO-2025-3835 CVE-2025-54386 GHSA-q6gg-9f92-r9wg\n  * GO-2025-3836 CVE-2025-6037 GHSA-6c5r-4wfc-3mcx\n  * GO-2025-3837 CVE-2025-5999 GHSA-6h4p-m86h-hhgh\n  * GO-2025-3838 CVE-2025-6000 GHSA-mr4h-qf9j-f665\n  * GO-2025-3839 CVE-2025-6011 GHSA-mwgr-84fv-3jh9\n  * GO-2025-3840 CVE-2025-6004 GHSA-qgj7-fmq2-6cc4\n  * GO-2025-3841 CVE-2025-6014 GHSA-qv3p-fmv3-9hww\n  * GO-2025-3842 CVE-2025-6015 GHSA-v6r4-35f9-9rpw\n  * GO-2025-3843 CVE-2025-8341 GHSA-3c93-92r7-j934\n  * GO-2025-3844 CVE-2025-53534 GHSA-fm3m-jrgm-5ppg\n  * GO-2025-3845 CVE-2025-54801 GHSA-qx2q-88mx-vhg7\n  * GO-2025-3847 CVE-2025-54799 GHSA-q82r-2j7m-9rv4\n  * GO-2025-3848 CVE-2025-6013 GHSA-7rx2-769v-hrwf\n  * GO-2025-3851 CVE-2025-44779 GHSA-93jv-pvg8-hf3v\n  * GO-2025-3852 CVE-2025-7195 GHSA-856v-8qm2-9wjv\n  * GO-2025-3853 CVE-2025-55000 GHSA-f7c3-mhj2-9pvg\n  * GO-2025-3854 CVE-2025-54999 GHSA-hh28-h22f-8357\n  * GO-2025-3855 CVE-2025-54998 GHSA-j3xv-7fxp-gfhx\n  * GO-2025-3856 CVE-2025-55003 GHSA-rxp7-9q75-vj3p\n  * GO-2025-3857 CVE-2025-54996 GHSA-vf84-mxrq-crqc\n  * GO-2025-3858 CVE-2025-54997 GHSA-xp75-r577-cvhp\n  * GO-2025-3859 CVE-2025-55001 GHSA-2q8q-8fgw-9p6p\n\n- Update to version 0.0.20250807T150727 2025-08-07T15:07:27Z (jsc#PED-11136)\n\n  Go CVE Numbering Authority IDs added or updated with aliases:\n  * GO-2025-3849 CVE-2025-47907\n","status":"published","published":"2025-08-19T12:52:27Z","modified":"2026-03-23T04:49:48.54789Z","updated_at":"2026-11-02T15:53:57.111474Z"}]}}