{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gofiber/fiber/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.52.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-66630"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-338"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-09T15:28:37Z",
    "nvd_published_at": "2026-02-09T18:16:04Z",
    "severity": "CRITICAL"
  },
  "details": "Fiber v2 contains an internal vendored copy of `gofiber/utils`, and its functions `UUIDv4()` and `UUID()` inherit the same critical weakness described in the upstream advisory. On **Go versions prior to 1.24**, the underlying `crypto/rand` implementation **can return an error** if secure randomness cannot be obtained. In such cases, these Fiber v2 UUID functions silently fall back to generating predictable values \u2014 the all-zero UUID `00000000-0000-0000-0000-000000000000`.\n\nOn Go **1.24+**, the language guarantees that `crypto/rand` no longer returns an error (it will block or panic instead), so this vulnerability primarily affects **Fiber v2 users running Go 1.23 or earlier**, which Fiber v2 officially supports.\n\nBecause no error is returned by the Fiber v2 UUID functions, application code may unknowingly rely on *predictable, repeated, or low-entropy identifiers* in security-critical pathways. This is especially impactful because many Fiber v2 middleware components (session middleware, CSRF, rate limiting, request-ID generation, etc.) **default to using `utils.UUIDv4()`**.\n\nImpact includes, but is not limited to:\n\n* **Session fixation or hijacking** (predictable session IDs)\n* **CSRF token forgery** or bypass\n* **Authentication replay / token prediction**\n* **Potential denial-of-service (DoS):** if the zero UUID is generated, key-based structures (sessions, rate-limits, caches, CSRF stores) may collapse into a single shared key, causing overwrites, lock contention, or state corruption\n* **Request-ID collisions**, undermining logging and trace integrity\n* **General compromise** of confidentiality, integrity, and authorization logic relying on UUIDs for uniqueness or secrecy\n\nAll Fiber v2 versions containing the internal `utils.UUIDv4()` / `utils.UUID()` implementation are affected when running on **Go \u003c1.24**. **No patched Fiber v2 release currently exists.**\n\n---\n\n## Suggested Mitigations / Workarounds\n\nUpdate to the latest version of Fiber v2.\n\n---\n\n### Likelihood / Environmental Factors\n\nIt\u2019s important to note that **entropy exhaustion on modern Linux systems is extremely rare**, as the kernel\u2019s CSPRNG is resilient and non-blocking. However, **entropy-source failures** \u2014 where `crypto/rand` cannot read from its underlying provider \u2014 are significantly more likely in certain environments.\n\nThis includes containerized deployments, restricted sandboxes, misconfigured systems lacking read access to `/dev/urandom` or platform-equivalent sources, chrooted or jailed environments, embedded devices, or systems with non-standard or degraded randomness providers. On **Go \u003c1.24**, such failures cause `crypto/rand` to return an error, which the Fiber v2 UUID functions currently treat as a signal to silently generate predictable UUIDs, including the zero UUID. This silent fallback is the root cause of the vulnerability.\n\n---\n\n## References\n\n* Upstream advisory for `gofiber/utils`: **GHSA-m98w-cqp3-qcqr**\n* Source repositories:\n\n  * `github.com/gofiber/fiber`\n  * `github.com/gofiber/utils`\n\n---\n\n## Credits / Reporter\n\nReported by **@sixcolors** (Fiber Maintainer / Security Team)",
  "id": "GHSA-68rr-p4fp-j59v",
  "modified": "2026-02-09T18:49:19Z",
  "published": "2026-02-09T15:28:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gofiber/fiber/security/advisories/GHSA-68rr-p4fp-j59v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66630"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gofiber/fiber/commit/eb874b6f6c5896b968d9b0ab2b56ac7052cb0ee1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gofiber/fiber"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gofiber/fiber/releases/tag/v2.52.11"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Fiber has an insecure fallback in utils.UUIDv4() / utils.UUID() \u2014 predictable / zero\u2011UUID on crypto/rand failure"
}