CVE Vulnerabilities

CVE-2025-66565

Unchecked Return Value

Published: Dec 09, 2025 | Modified: Dec 11, 2025
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
Ubuntu
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Fiber Utils is a collection of common functions created for Fiber. In versions 2.0.0-rc.3 and below, when the systems 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.

Weakness

The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions.

Affected Software

NameVendorStart VersionEnd Version
UtilsGofiber*1.2.0 (including)
UtilsGofiber2.0.0-beta1 (including)2.0.0-beta1 (including)
UtilsGofiber2.0.0-beta10 (including)2.0.0-beta10 (including)
UtilsGofiber2.0.0-beta11 (including)2.0.0-beta11 (including)
UtilsGofiber2.0.0-beta12 (including)2.0.0-beta12 (including)
UtilsGofiber2.0.0-beta13 (including)2.0.0-beta13 (including)
UtilsGofiber2.0.0-beta14 (including)2.0.0-beta14 (including)
UtilsGofiber2.0.0-beta2 (including)2.0.0-beta2 (including)
UtilsGofiber2.0.0-beta3 (including)2.0.0-beta3 (including)
UtilsGofiber2.0.0-beta4 (including)2.0.0-beta4 (including)
UtilsGofiber2.0.0-beta5 (including)2.0.0-beta5 (including)
UtilsGofiber2.0.0-beta6 (including)2.0.0-beta6 (including)
UtilsGofiber2.0.0-beta7 (including)2.0.0-beta7 (including)
UtilsGofiber2.0.0-beta8 (including)2.0.0-beta8 (including)
UtilsGofiber2.0.0-beta9 (including)2.0.0-beta9 (including)
UtilsGofiber2.0.0-rc1 (including)2.0.0-rc1 (including)
UtilsGofiber2.0.0-rc2 (including)2.0.0-rc2 (including)
UtilsGofiber2.0.0-rc3 (including)2.0.0-rc3 (including)
UtilsGofiber2.0.0-rc4 (including)2.0.0-rc4 (including)

Potential Mitigations

References