medium6.5
CVE-2026-30246
Fiber's cache middleware default key generator ignores query string, causing response mix-up across distinct query parameters
Impact
Fiber is a web framework for Go. In github.com/gofiber/fiber/v3 versions through 3.1.0, the default key generator in the cache middleware uses only the request path and does not include the query string. As a result, requests for the same path with different query parameters can share a cache key and receive the wrong cached response. This can cause response mix-up for query-dependent endpoints and may expose data intended for a different request. This issue is fixed after version 3.1.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/gofiber/fiber/v3 | <= 3.1.0 | 3.2.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Gofiber | Fiber | through 3.1.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-35hp-hqmv-8qg8
- https://github.com/gofiber/fiber/security/advisories/GHSA-35hp-hqmv-8qg8
- https://github.com/gofiber/fiber/commit/050ff1ff18511c1475b8ec627460216aaecddd4e
- https://github.com/gofiber/fiber/commit/9a0d12c07ed895b84c72987f9288b04137afe5de
- https://nvd.nist.gov/vuln/detail/CVE-2026-30246
- https://github.com/gofiber/fiber/blob/main/middleware/cache/cache_test.go#L599-L621
- https://github.com/gofiber/fiber/blob/main/middleware/cache/config.go#L90-L92