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Medium

Fiber has a Denial of Service Vulnerability via Route Parameter Overflow

Type: advisorySources: OSV

Fiber is an Express inspired web framework written in Go. A denial of service vulnerability exists in Fiber v2 and v3 that allows remote attackers to crash the application by sending requests to routes with more than 30 parameters. The vulnerability results from missing validation during route registration combined with an unbounded array write during request matching. Version 2.52.12 patches the issue in the v2 branch and 3.1.0 patches the issue in the v3 branch.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-25882
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 21:59 UTC · Revision 1

Source evidence

Fiber has a Denial of Service Vulnerability via Route Parameter Overflow

core-osv · Original source

Published 24 Feb 2026, 21:05 UTC

Fiber is an Express inspired web framework written in Go. A denial of service vulnerability exists in Fiber v2 and v3 that allows remote attackers to crash the application by sending requests to routes with more than 30 parameters. The vulnerability results from missing validation during route registration combined with an unbounded array write during request matching. Version 2.52.12 patches the issue in the v2 branch and 3.1.0 patches the issue in the v3 branch.

osv:CVE-2026-25882
Complete source record
{
  "id": "7cac3d87618f4cbb83fc585aba2c4827df8f0010bf7d3493674faa091a0379fe",
  "url": "https://osv.dev/vulnerability/CVE-2026-25882",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Fiber has a Denial of Service Vulnerability via Route Parameter Overflow",
    "summary": "Fiber is an Express inspired web framework written in Go. A denial of service vulnerability exists in Fiber v2 and v3 that allows remote attackers to crash the application by sending requests to routes with more than 30 parameters. The vulnerability results from missing validation during route registration combined with an unbounded array write during request matching. Version 2.52.12 patches the issue in the v2 branch and 3.1.0 patches the issue in the v3 branch.",
    "evidence": "osv:CVE-2026-25882",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-25882",
      "aliases": [
        "CVE-2026-25882",
        "GHSA-mrq8-rjmw-wpq3",
        "GO-2026-4543"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/gofiber/fiber",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f3434e503771785088b15a91946661fc00e2da49"
                },
                {
                  "fixed": "6cba19533db837ae5c9c0f5941dec5dae019e18c"
                },
                {
                  "introduced": "f8f34f642fb3682c341ede7816e7cf861aa7df89"
                },
                {
                  "fixed": "3c24ebefe5009e88f9f9258b472e8021160179bf"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "fixed": "2.52.12"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*",
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "3.1.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.52.11",
            "v2.52.10",
            "v3.0.0-rc.2",
            "v3.0.0-rc.1",
            "v3.0.0-beta.5",
            "v2.52.9",
            "v2.52.8",
            "v2.52.7",
            "v2.52.6",
            "v3.0.0-beta.4",
            "v2.52.5",
            "v3.0.0-beta.3",
            "v2.52.4",
            "v2.52.3",
            "v2.52.2",
            "v2.52.1",
            "v2.52.0",
            "v2.51.0",
            "v2.50.0",
            "v2.49.2",
            "v2.49.1",
            "v2.49.0",
            "v2.48.0",
            "v2.47.0",
            "v2.46.0",
            "v2.45.0",
            "v2.44.0",
            "v2.43.0",
            "v2.42.0",
            "v2.41.0",
            "v2.40.1",
            "v2.40.0",
            "v2.39.0",
            "v2.38.1",
            "v2.38.0",
            "v2.37.1",
            "v2.37.0",
            "v2.37.0-rc.1",
            "v2.36.0",
            "v2.35.0",
            "v2.34.1",
            "v2.34.0",
            "v2.34.0-rc.1",
            "v2.33.0",
            "v2.32.0",
            "v2.31.0",
            "v2.30.0",
            "v2.29.0",
            "v2.28.0",
            "v2.27.0",
            "v2.26.0",
            "v2.25.0",
            "v2.24.0",
            "v2.23.0",
            "v2.22.0",
            "v2.21.0",
            "v2.20.2",
            "v2.20.1",
            "v2.20.0",
            "v2.19.0",
            "v2.18.0",
            "v2.17.0",
            "v2.16.0",
            "v2.15.0",
            "v2.14.0",
            "v2.13.0",
            "v2.12.0",
            "v2.11.0",
            "v2.10.0",
            "v2.9.0",
            "v2.8.0",
            "v2.7.1",
            "v2.7.0",
            "v2.6.0",
            "v2.4.1",
            "v2.5.0",
            "v2.4.0",
            "v2.3.3",
            "v2.3.2",
            "v2.3.1",
            "v2.3.0",
            "v2.2.5",
            "v2.2.4",
            "v2.2.3",
            "v2.2.2",
            "v2.2.1",
            "v2.2.0",
            "v2.1.4",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.6",
            "v2.0.5",
            "v2.0.4",
            "v2.0.3",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25882.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.156068687Z",
      "provider": "osv",
      "references": [
        "https://github.com/gofiber/fiber/blob/main/path.go#L514",
        "https://github.com/gofiber/fiber/blob/v2/path.go#L516",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25882.json",
        "https://github.com/gofiber/fiber/security/advisories/GHSA-mrq8-rjmw-wpq3",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-25882",
        "https://github.com/gofiber/fiber/pull/3962"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-129"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25882.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-25882",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490429,
  "published_at": "2026-02-24T21:05:28.211+00:00"
}