Vulnerability-Lookup

CVE-2026-30246 (GCVE-0-2026-30246)

Vulnerability from cvelistv5 – Published: 2026-05-05 12:40 – Updated: 2026-05-05 15:04

Title

github.com/gofiber/fiber/v3 cache middleware can mix responses across query parameters

Summary

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.

Severity ?

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CWE

CWE-436 - Interpretation Conflict

Assigner

GitHub_M

References

URL

Tags

	https://github.com/gofiber/fiber/security/advisor…	x_refsource_CONFIRM
	https://github.com/gofiber/fiber/blob/main/middle…	x_refsource_MISC
	https://github.com/gofiber/fiber/blob/main/middle…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	gofiber	fiber	Affected: >= v3.0.0-beta.2, < 3.1.0

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-30246

Vulnerability from fkie_nvd - Published: 2026-05-05 13:16 - Updated: 2026-05-05 16:16

Severity ?

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/gofiber/fiber/blob/main/middleware/cache/cache_test.go#L599-L621
	security-advisories@github.com	https://github.com/gofiber/fiber/blob/main/middleware/cache/config.go#L90-L92
	security-advisories@github.com	https://github.com/gofiber/fiber/security/advisories/GHSA-35hp-hqmv-8qg8
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/gofiber/fiber/security/advisories/GHSA-35hp-hqmv-8qg8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-30246",
  "lastModified": "2026-05-05T16:16:11.090",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-05T13:16:28.820",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/blob/main/middleware/cache/cache_test.go#L599-L621"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/blob/main/middleware/cache/config.go#L90-L92"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/security/advisories/GHSA-35hp-hqmv-8qg8"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/gofiber/fiber/security/advisories/GHSA-35hp-hqmv-8qg8"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-436"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-35HP-HQMV-8QG8

Vulnerability from github – Published: 2026-04-28 22:28 – Updated: 2026-04-28 22:28

Summary

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

Details

Summary

Fiber cache middleware's default key generator uses only c.Path() and does not include the query string. As a result, requests like /?id=1 and /?id=2 can map to the same cache key and share the same cached response.

This can cause response mix-up (cache poisoning-like behavior) for endpoints where response content depends on query parameters.

Details

Default configuration in cache middleware:

KeyGenerator: func(c fiber.Ctx) string { return utils.CopyString(c.Path()) }

References: - https://github.com/gofiber/fiber/blob/main/middleware/cache/config.go#L90-L92 - https://github.com/gofiber/fiber/blob/main/middleware/cache/cache_test.go#L599-L621

The existing test demonstrates that when handler output depends on query parameter id, a second request with a different query still returns the first cached response (cache hit), confirming query is not part of the default cache key.

PoC

Minimal PoC:

package main

import (
    "log"

    "github.com/gofiber/fiber/v3"
    "github.com/gofiber/fiber/v3/middleware/cache"
)

func main() {
    app := fiber.New()
    app.Use(cache.New()) // default config

    app.Get("/", func(c fiber.Ctx) error {
        return c.SendString(c.Query("id", "1"))
    })

    log.Fatal(app.Listen(":3000"))
}

Reproduction:

GET /?id=1
Cache miss
Response body: 1
GET /?id=2
Cache hit
Response body: 1 (expected 2)

Local verification command used:

go test ./middleware/cache -run Test_Cache_WithNoCacheRequestDirective -count=1

Observed result: test passes, confirming this is current behavior.

Impact

Responses that should vary by query parameters can be mixed between requests.
In real deployments, this may leak or corrupt user/tenant-specific content if query parameters influence context or data selection.
This is deployment-dependent but security-relevant, and not safe-by-default for query-variant responses.

Suggested remediation

Change default cache key generation to include path + normalized query string (or canonicalized original URL).
Keep ability for custom key generators.
Add explicit documentation warning that path-only keying is unsafe for query-dependent responses.

Severity ?

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.1.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gofiber/fiber/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-30246"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-524"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-28T22:28:14Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nFiber cache middleware\u0027s default key generator uses only `c.Path()` and does not include the query string.\nAs a result, requests like `/?id=1` and `/?id=2` can map to the same cache key and share the same cached response.\n\nThis can cause response mix-up (cache poisoning-like behavior) for endpoints where response content depends on query parameters.\n\n### Details\nDefault configuration in cache middleware:\n\n- `KeyGenerator: func(c fiber.Ctx) string { return utils.CopyString(c.Path()) }`\n\nReferences:\n- https://github.com/gofiber/fiber/blob/main/middleware/cache/config.go#L90-L92\n- https://github.com/gofiber/fiber/blob/main/middleware/cache/cache_test.go#L599-L621\n\nThe existing test demonstrates that when handler output depends on query parameter `id`, a second request with a different query still returns the first cached response (cache hit), confirming query is not part of the default cache key.\n\n### PoC\nMinimal PoC:\n\n```go\npackage main\n\nimport (\n    \"log\"\n\n    \"github.com/gofiber/fiber/v3\"\n    \"github.com/gofiber/fiber/v3/middleware/cache\"\n)\n\nfunc main() {\n    app := fiber.New()\n    app.Use(cache.New()) // default config\n\n    app.Get(\"/\", func(c fiber.Ctx) error {\n        return c.SendString(c.Query(\"id\", \"1\"))\n    })\n\n    log.Fatal(app.Listen(\":3000\"))\n}\n```\n\nReproduction:\n\n1. `GET /?id=1`\n   - Cache miss\n   - Response body: `1`\n2. `GET /?id=2`\n   - Cache hit\n   - Response body: `1` (expected `2`)\n\nLocal verification command used:\n\n```bash\ngo test ./middleware/cache -run Test_Cache_WithNoCacheRequestDirective -count=1\n```\n\nObserved result: test passes, confirming this is current behavior.\n\n### Impact\n- Responses that should vary by query parameters can be mixed between requests.\n- In real deployments, this may leak or corrupt user/tenant-specific content if query parameters influence context or data selection.\n- This is deployment-dependent but security-relevant, and not safe-by-default for query-variant responses.\n\n### Suggested remediation\n- Change default cache key generation to include path + normalized query string (or canonicalized original URL).\n- Keep ability for custom key generators.\n- Add explicit documentation warning that path-only keying is unsafe for query-dependent responses.",
  "id": "GHSA-35hp-hqmv-8qg8",
  "modified": "2026-04-28T22:28:14Z",
  "published": "2026-04-28T22:28:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gofiber/fiber/security/advisories/GHSA-35hp-hqmv-8qg8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gofiber/fiber/commit/050ff1ff18511c1475b8ec627460216aaecddd4e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gofiber/fiber/commit/9a0d12c07ed895b84c72987f9288b04137afe5de"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gofiber/fiber"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Fiber\u0027s cache middleware default key generator ignores query string, causing response mix-up across distinct query parameters"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-30246 (GCVE-0-2026-30246)

FKIE_CVE-2026-30246

GHSA-35HP-HQMV-8QG8

Summary

Details

PoC

Impact

Suggested remediation

Tags

Sightings

Nomenclature