CVE-2025-48075: fiber — Exploit & Fix

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-129 CWE-129

Affected Products

Vendor	Product	Versions
gofiber	fiber	2.0.0 — 2.52.7

References

Advisories & Patches

https://github.com/gofiber/fiber/commit/e115c08b8f059a4a031b492aa9eef0712411853d https://github.com/gofiber/fiber/security/advisories/GHSA-hg3g-gphw-5hhm https://github.com/gofiber/fiber/security/advisories/GHSA-hg3g-gphw-5hhm

Exploits

https://github.com/gofiber/fiber/security/advisories/GHSA-hg3g-gphw-5hhm https://github.com/gofiber/fiber/security/advisories/GHSA-hg3g-gphw-5hhm

Frequently Asked Questions

What is CVE-2025-48075? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-48075? +

CVE-2025-48075 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-48075? +

CVE-2025-48075 affects products from gofiber, specifically: fiber. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-48075? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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