CVE-2025-48075: 
Wolfi vulnerability analysis and mitigation

Fiber, an Express-inspired web framework written in Go, contains a vulnerability (CVE-2025-48075) in versions 2.52.6 and prior to version 2.52.7. The vulnerability was discovered in the fiber.Ctx.BodyParser functionality, which can map flat data to nested slices using key[idx]value syntax. The issue was disclosed on May 22, 2025 (GitHub Advisory).

The vulnerability occurs when the fiber.Ctx.BodyParser attempts to process a negative index value in the slice mapping syntax. Instead of properly handling the invalid input and returning an error, the parser triggers a panic. This is due to an improper validation of array indices, identified as CWE-129. The vulnerability has been assigned a CVSS v4.0 score of 7.7 HIGH with the vector string 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 (NVD).

Since the input data is user-provided, this vulnerability could lead to a denial of service condition for applications relying on the fiber.Ctx.BodyParser functionality. When exploited, the application will crash due to an unhandled panic, making the service unavailable (GitHub Advisory).

The vulnerability can be exploited by sending a specially crafted request with a negative index in the key[idx]value syntax to any endpoint that uses the fiber.Ctx.BodyParser functionality. No special privileges or conditions are required to exploit this vulnerability (GitHub Advisory).

The vulnerability has been fixed in version 2.52.7 of the Fiber framework. Users are advised to upgrade to this version to address the issue. The fix includes proper error handling for invalid array indices instead of panicking (GitHub Advisory, Fiber Commit).