IP Spoofing in Crystal Shard http-protection 0.2.0 Enables Bypass

Publication date: 2026-01-30

Last updated on: 2026-01-30

Assigner: VulnCheck

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.

CVSS Scores

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Meta Information

Published

2026-01-30

Last Modified

2026-01-30

Generated

2026-07-06

AI Q&A

2026-01-31

EPSS Evaluated

2026-07-05

NVD

CVE-2020-37056

EUVD

EUVD-2020-30926

Affected Vendors & Products

Vendor	Product	Version / Range
crystal_shard	http-protection	0.2.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-290	This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

Attack-Flow Graph

Executive Summary

This vulnerability in Crystal Shard http-protection 0.2.0 is an IP spoofing issue where attackers can manipulate request headers such as X-Forwarded-For, X-Client-IP, and X-Real-IP by hardcoding consistent IP values. This manipulation allows them to bypass the protection middleware's security checks.

Impact Analysis

The vulnerability can allow attackers to circumvent security protections and gain unauthorized access to systems or resources by spoofing IP addresses in request headers, potentially leading to data breaches or other security incidents.

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