Crystal Shard vulnerabilities

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Published CVEs affecting Crystal Shard products: 1 record(s), with severity, exploitation and fixes.

Http-protection 1

Exploited only (KEV) →

CVE-2020-37056 Critical · 9.8 CWE-290 Jan 30, 2026

Crystal http-protection IP Spoofing Authentication Bypass (CVE-2020-37056)

Crystal Shard http-protection 0.2.0 contains an IP spoofing vulnerability that allows attackers to bypass protection middleware by manipulating request headers. Attackers can hardcode consistent IP values across X-Forwarded-For, X-Client-IP, and X-Real-IP headers to circumvent security checks and gain unauthorized access.