CVE-2020-37056
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductCrystal Shard Http-protection
PublishedJan 30, 2026
First seenJan 30, 2026
Weakness typeCWE-290CWE-290
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Crystal Shard http-protection | <= 0.2.0 | — |
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