CVE-2025-66565

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Source
https://cve.org/CVERecord?id=CVE-2025-66565
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-66565.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-66565
Aliases
Downstream
Related
Published
2025-12-09T01:47:58Z
Modified
2026-10-22T10:30:56Z
Severity
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values
Details

Fiber Utils is a collection of common functions created for Fiber. In versions 2.0.0-rc.3 and below, when the system's cryptographic random number generator (crypto/rand) fails, both functions silently fall back to returning predictable UUID values, including the zero UUID "00000000-0000-0000-0000-000000000000". The vulnerability occurs through two related but distinct failure paths, both ultimately caused by crypto/rand.Read() failures, compromising the security of all Fiber applications using these functions for security-critical operations. This issue is fixed in version 2.0.0-rc.4.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-252",
        "CWE-331",
        "CWE-338"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66565.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "github.com/gofiber/utils/v2 < 2.0.0-rc.4"
                        },
                        {
                            "last_affected": "github.com/gofiber/utils/v2 < 2.0.0-rc.4"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/gofiber/utils

Affected ranges

Type
GIT
Repo
https://github.com/gofiber/utils
Events
Introduced
b986fcc3965a3570e3b755646a026641af8c2da4
Fixed
6c6cf047032b9c8dff43d29f990b4b10e9b02d47
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "github.com/gofiber/utils <= 1.2.0"
                },
                {
                    "last_affected": "github.com/gofiber/utils <= 1.2.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "fixed": "6c6cf047032b9c8dff43d29f990b4b10e9b02d47"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

github.*
github.com/gofiber/utils <= 1.2.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-66565.json"