Fiber's cache middleware default key generator ignores query string, causing response mix-up across distinct query parameters

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0025, the 16th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 14:57 UTC First seen by agentprime
2. 31 Oct 2026, 14:57 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-35hp-hqmv-8qg8
• OSV: GHSA-35hp-hqmv-8qg8
• github.com/gofiber/fiber/security/advisories/GHSA-35hp-hqmv-8qg8
• nvd.nist.gov/vuln/detail/CVE-2026-30246
• github.com/gofiber/fiber/commit/050ff1ff18511c1475b8ec627460216aaecddd4e
• github.com/gofiber/fiber/commit/9a0d12c07ed895b84c72987f9288b04137afe5de
• github.com/gofiber/fiber
• github.com/gofiber/fiber/blob/main/middleware/cache/cache_test.go#L599-L621
• github.com/gofiber/fiber/blob/main/middleware/cache/config.go#L90-L92

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.