CVE-2025-66565

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Source
https://cve.org/CVERecord?id=CVE-2025-66565
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66565.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-66565
Aliases
Downstream
Related
Published
2025-12-09T01:47:58.430Z
Modified
2026-08-12T03:51:48.098878920Z
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 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66565.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "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"
        }
    ],
    "cwe_ids": [
        "CWE-252",
        "CWE-331",
        "CWE-338"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/gofiber/utils

Affected ranges

Type
GIT
Repo
https://github.com/gofiber/utils
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
6c6cf047032b9c8dff43d29f990b4b10e9b02d47
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:gofiber:utils:*:*:*:*:*:go:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "1.2.0"
        }
    ]
}

Affected versions

github.*
github.com/gofiber/utils <= 1.2.0
v0.*
v0.0.1
v0.0.10
v0.0.2
v0.0.3
v0.0.4
v0.0.5
v0.0.6
v0.0.7
v0.0.8
v0.0.9
v0.1
v0.1.0
v0.1.1
v0.1.2
v1.*
v1.0.0
v1.0.0-beta.1
v1.0.0-beta.2
v1.0.1
v2.*
v2.0.0-beta.1
v2.0.0-beta.10
v2.0.0-beta.11
v2.0.0-beta.12
v2.0.0-beta.13
v2.0.0-beta.14
v2.0.0-beta.2
v2.0.0-beta.3
v2.0.0-beta.4
v2.0.0-beta.5
v2.0.0-beta.6
v2.0.0-beta.7
v2.0.0-beta.8
v2.0.0-beta.9
v2.0.0-rc.1
v2.0.0-rc.2
v2.0.0-rc.3

Database specific

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