What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-05 · updated 2026-10-26
• Weakness: CWE-436

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.

Affected products

• gofiber fiber: through 3.1.0

References

• 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
• https://github.com/gofiber/fiber/security/advisories/GHSA-35hp-hqmv-8qg8
• https://github.com/gofiber/fiber/security/advisories/GHSA-35hp-hqmv-8qg8

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