Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gofiber | Fiber | < 2.52.9 |
Related Weaknesses (CWE)
References
- https://github.com/gofiber/fiber/commit/e115c08b8f059a4a031b492aa9eef0712411853dPatch
- https://github.com/gofiber/fiber/security/advisories/GHSA-qx2q-88mx-vhg7Vendor Advisory
- https://github.com/gofiber/fiber/security/advisories/GHSA-qx2q-88mx-vhg7Vendor Advisory
FAQ
What is CVE-2025-54801?
CVE-2025-54801 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 inde...
How severe is CVE-2025-54801?
CVE-2025-54801 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-54801?
Check the references section above for vendor advisories and patch information. Affected products include: Gofiber Fiber.