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Golang CVE-2025-66630

CRITICAL
Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) (CWE-338)
2026-02-09 security-advisories@github.com GHSA-68rr-p4fp-j59v
9.4
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
9.4 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
SUSE
CRITICAL
qualitative
Red Hat
7.7 HIGH
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
Patch released
Feb 28, 2026 - 00:26 nvd
Patch available
CVE Published
Feb 09, 2026 - 18:16 nvd
CRITICAL 9.4

DescriptionGitHub Advisory

Fiber is an Express inspired web framework written in Go. Before 2.52.11, on Go versions prior to 1.24, the underlying crypto/rand implementation can return an error if secure randomness cannot be obtained. Because no error is returned by the Fiber v2 UUID functions, application code may unknowingly rely on predictable, repeated, or low-entropy identifiers in security-critical pathways. This is especially impactful because many Fiber v2 middleware components (session middleware, CSRF, rate limiting, request-ID generation, etc.) default to using utils.UUIDv4(). This vulnerability is fixed in 2.52.11.

AnalysisAI

Go Fiber web framework before 2.52.11 has a weak PRNG vulnerability (on Go < 1.24) that makes session tokens predictable, enabling session hijacking.

Technical ContextAI

Fiber < 2.52.11 uses a CWE-338 cryptographically weak PRNG for session token generation on Go versions prior to 1.24, making tokens predictable.

RemediationAI

Update Fiber to 2.52.11+ or use Go 1.24+.

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Leap 15.6 Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP5 Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP6 Fixed
openSUSE Leap 15.5 Fixed

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CVE-2025-66630 vulnerability details – vuln.today

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