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EUVD-2026-188592

fkie_cve-2023-41338

Fiber is an Express inspired web framework built in the go language. Versions of gofiber prior to 2.49.2 did not properly restrict access to localhost. This issue impacts users of our project who rely on the `ctx.IsFromLocal` method to restrict access to localhost requests. If exploited, it could allow unauthorized access to resources intended only for localhost. Setting `X-Forwarded-For: 127.0.0.1` in a request from a foreign host, will result in true for `ctx.IsFromLocal`. Access is limited to the scope of the affected process. This issue has been patched in version `2.49.2` with commit `b8c9ede6`. Users are advised to upgrade. There are no known workarounds to remediate this vulnerability without upgrading to the patched version.

GHSA-3q5p-3558-364f — Fiber unauthorized access vulnerability in `ctx.IsFromLocal()`

Affected: Go: github.com/gofiber/fiber, Go: github.com/gofiber/fiber/v2

### Impact This vulnerability can be categorized as a security misconfiguration. It impacts users of our project who rely on the [ctx.IsFromLocal()](https://docs.gofiber.io/api/ctx#isfromlocal) method to restrict access to localhost requests. If exploited, it could allow unauthorized access to resources intended only for localhost.

In it's implementation it uses c.IPs():

```go // IPs returns a string slice of IP addresses specified in the X-Forwarded-For request header. // When IP validation is enabled, only valid IPs are returned. func (c *Ctx) IPs() []string { return c.extractIPsFromHeader(HeaderXForwardedFor) } ```

Thereby, setting `X-Forwarded-For: 127.0.0.1` in a request from a foreign host, will result in true for [ctx.IsFromLocal()](https://docs.gofiber.io/api/ctx#isfromlocal)

### Patches This issue has been patched in `v2.49.2` with commit [b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc](https://github.com/gofiber/fiber/commit/b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc)

### Workarounds Currently, there are no known workarounds to remediate this vulnerability without upgrading to the patched version. We strongly advise users to apply the patch as soon as it is released.

### References For further information and context regarding this security issue, please refer to the following resources:

- [Mozilla Developer Network - X-Forwarded-For](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For)

Most recent entries from all

EUVD-2026-188592

fkie_cve-2023-41338

GHSA-3q5p-3558-364f — Fiber unauthorized access vulnerability in `ctx.IsFromLocal()`

gsd-2023-41338