CVE-2026-30246 github.com/gofiber/fiber/v3 cache middleware can mix responses across query parameters

What is CVE-2026-30246?

CVE-2026-30246 is a medium-severity vulnerability in gofiber fiber, published on 5 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-436

Which versions are affected by CVE-2026-30246?

3 open source packages ship an affected version, including github.com/gofiber/fiber/v3. It affects 1 product.

Products include Gofiber Fiber.

How do I fix CVE-2026-30246?

Upgrade github.com/gofiber/fiber/v3 to 3.2.0 or later.

Is CVE-2026-30246 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30246 exists.

Other vulnerabilities in gofiber fiber

• CVE-2024-38513 Fiber Session Middleware Token Injection Vulnerability Critical 10.0
• CVE-2023-45128 CSRF Token Reuse Vulnerability in fiber Critical 10.0
• CVE-2024-25124 Fiber has Insecure CORS Configuration, Allowing Wildcard Origin with Credentials Critical 9.4
• CVE-2025-66630 Fiber insecurely fallsback in utils.UUIDv4() / utils.UUID() — predictable / zero‑UUID on crypto/rand failure Critical 9.2
• CVE-2025-54801 Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder High 8.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-35hp-hqmv-8qg8, GO-2026-5069.