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. Version 2.52.7 fixes the issue.

Classification

CVE ID: CVE-2025-48075

CVSS Base Severity: HIGH

CVSS Base Score: 7.7

CVSS 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

Affected Products

Vendor: gofiber

Product: fiber

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 16.25% (scored less or equal to compared to others)

EPSS Date: 2025-06-09 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-48075
https://github.com/gofiber/fiber/security/advisories/GHSA-hg3g-gphw-5hhm
https://github.com/gofiber/fiber/commit/e115c08b8f059a4a031b492aa9eef0712411853d

Timeline