GHSA-m98w-cqp3-qcqr: github.com/gofiber/utils (CVE-2025-66565)

Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values in github.com/gofiber/utils

CVSS 9.3 CriticalCriticalEPSS 0.0047 · 40th percentile

Critical, because:

CVSS score 9.3: 9.0 or more.

Published by the GitHub Advisory Database at 15 Dec 2025, 19:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
github.com/gofiber/utils	Go	<1.2.0	1.2.0
github.com/gofiber/utils/v2	Go	<2.0.0-rc.4	2.0.0-rc.4

Identifiers

GHSA-m98w-cqp3-qcqr · CVE-2025-66565 · GO-2025-4208

Weakness (CWE)

CWE-252 · CWE-331 · CWE-338

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.3	Critical	4.0	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	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0047, the 40th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 15 Dec 2025. New records show when each source confirmed them.

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.