{"cve":"CVE-2025-66565","nvd":{"published":"2025-12-09T16:18:21.097","modified":"2026-10-07T20:10:01.970","status":"Analyzed","description":"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.","cvss_v4":{"vector":"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","score":9.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-252","CWE-338","CWE-331"],"references":["https://github.com/gofiber/utils/commit/6c6cf047032b9c8dff43d29f990b4b10e9b02d47","https://github.com/gofiber/utils/security/advisories/GHSA-m98w-cqp3-qcqr","https://github.com/gofiber/utils/security/advisories/GHSA-m98w-cqp3-qcqr"],"products":["gofiber:utils"],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2025-66565","score":0.00468,"percentile":0.40238,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-m98w-cqp3-qcqr","url":"https://osv.dev/vulnerability/GHSA-m98w-cqp3-qcqr","summary":"Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values","modified":"2025-12-15T19:56:09.002075Z","packages":[{"ecosystem":"Go","name":"github.com/gofiber/utils/v2","purl":"pkg:golang/github.com/gofiber/utils/v2","ranges":["<2.0.0-rc.4"],"fixed":["2.0.0-rc.4"]},{"ecosystem":"Go","name":"github.com/gofiber/utils","purl":"pkg:golang/github.com/gofiber/utils","ranges":["<1.2.0"],"fixed":["1.2.0"]}]},{"id":"GO-2025-4208","url":"https://osv.dev/vulnerability/GO-2025-4208","summary":"Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values in github.com/gofiber/utils","modified":"2026-03-03T04:57:45.990034Z","packages":[{"ecosystem":"Go","name":"github.com/gofiber/utils","purl":"pkg:golang/github.com/gofiber/utils","ranges":["<1.2.0"],"fixed":["1.2.0"]},{"ecosystem":"Go","name":"github.com/gofiber/utils/v2","purl":"pkg:golang/github.com/gofiber/utils/v2","ranges":["<2.0.0-rc.4"],"fixed":["2.0.0-rc.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}