Vulnerability-Lookup

CVE-2025-66630 (GCVE-0-2025-66630)

Vulnerability from cvelistv5 – Published: 2026-02-09 18:04 – Updated: 2026-02-10 16:02

Title

Fiber insecurely fallsback in utils.UUIDv4() / utils.UUID() — predictable / zero‑UUID on crypto/rand failure

Summary

Fiber is an Express inspired web framework written in Go. Before 2.52.11, on Go versions prior to 1.24, the underlying crypto/rand implementation can return an error if secure randomness cannot be obtained. Because 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(). This vulnerability is fixed in 2.52.11.

Severity ?

9.2 (Critical)


                        
                          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

CWE

CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Assigner

GitHub_M

References

URL

Tags

	https://github.com/gofiber/fiber/security/advisor…	x_refsource_CONFIRM
	https://github.com/gofiber/fiber/commit/eb874b6f6…	x_refsource_MISC
	https://github.com/gofiber/fiber/releases/tag/v2.52.11	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	gofiber	fiber	Affected: < 2.52.11

Show details on NVD website

JSON

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GHSA-68RR-P4FP-J59V

Vulnerability from github – Published: 2026-02-09 15:28 – Updated: 2026-02-09 18:49

Summary

Fiber has an insecure fallback in utils.UUIDv4() / utils.UUID() — predictable / zero‑UUID on crypto/rand failure

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 — the all-zero UUID 00000000-0000-0000-0000-000000000000.

On 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.

Because 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().

Impact includes, but is not limited to:

Session fixation or hijacking (predictable session IDs)
CSRF token forgery or bypass
Authentication replay / token prediction
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
Request-ID collisions, undermining logging and trace integrity
General compromise of confidentiality, integrity, and authorization logic relying on UUIDs for uniqueness or secrecy

All Fiber v2 versions containing the internal utils.UUIDv4() / utils.UUID() implementation are affected when running on Go <1.24. No patched Fiber v2 release currently exists.

Suggested Mitigations / Workarounds

Update to the latest version of Fiber v2.

Likelihood / Environmental Factors

It’s important to note that entropy exhaustion on modern Linux systems is extremely rare, as the kernel’s CSPRNG is resilient and non-blocking. However, entropy-source failures — where crypto/rand cannot read from its underlying provider — are significantly more likely in certain environments.

This 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 <1.24, 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.

References

Upstream advisory for gofiber/utils: GHSA-m98w-cqp3-qcqr
Source repositories:
github.com/gofiber/fiber
github.com/gofiber/utils

Credits / Reporter

Reported by @sixcolors (Fiber Maintainer / Security Team)

Severity ?

9.2 (Critical)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "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"
}

FKIE_CVE-2025-66630

Vulnerability from fkie_nvd - Published: 2026-02-09 18:16 - Updated: 2026-02-09 21:55

Severity ?

9.2 (Critical) - 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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/gofiber/fiber/commit/eb874b6f6c5896b968d9b0ab2b56ac7052cb0ee1
	security-advisories@github.com	https://github.com/gofiber/fiber/releases/tag/v2.52.11
	security-advisories@github.com	https://github.com/gofiber/fiber/security/advisories/GHSA-68rr-p4fp-j59v

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "lang": "en",
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    }
  ],
  "id": "CVE-2025-66630",
  "lastModified": "2026-02-09T21:55:30.093",
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          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-02-09T18:16:04.680",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/commit/eb874b6f6c5896b968d9b0ab2b56ac7052cb0ee1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/releases/tag/v2.52.11"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/security/advisories/GHSA-68rr-p4fp-j59v"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-338"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

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-2025-66630 (GCVE-0-2025-66630)

GHSA-68RR-P4FP-J59V

Suggested Mitigations / Workarounds

Likelihood / Environmental Factors

References

Credits / Reporter

FKIE_CVE-2025-66630

Tags

Sightings

Nomenclature