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CVE-2026-57209— Heimdall: Forwarded Header Injection via Unsanitized Host Header in Proxy Mode

Quick assessment

Affected
dadrus heimdall
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Heimdall 是一款云原生的身份感知代理（Identity Aware Proxy）与访问控制决策服务。在 0.17.17 版本之前，当 Heimdall 运行于代理模式时，会在执行匹配的规则管道后构建 HTTP 请求头，并将传入请求的 头值直接插入到该头字段字符串中，而未对逗号或分号进行过滤。这使得攻击者能够在 头中注入额外参数，从而可能向上游服务伪造 IP 地址。该问题已在 0.17.17 版本中修复。

CVSS 7.0 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
dadrus heimdall < 0.17.17 affected
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I. Basic Information for CVE-2026-57209

Vulnerability Information
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Vulnerability Title
Heimdall: Forwarded Header Injection via Unsanitized Host Header in Proxy Mode
Source: CVE Program / CVE List V5
Vulnerability Description
Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.17, when Heimdall operates in proxy mode, it constructs the Forwarded HTTP header after executing the matched rule pipeline by inserting the incoming request's Host header value directly into the header string without sanitizing commas or semicolons. This allows an attacker to inject additional parameters into the Forwarded header, potentially spoofing IP addresses for upstream services. This issue has been patched in version 0.17.17.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
dadrus heimdall < 0.17.17 -

II. Public POCs for CVE-2026-57209

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III. Intelligence Information for CVE-2026-57209

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Vendor Advisories for CVE-2026-57209 (1)

Vendor Pages for CVE-2026-57209 (1)

IV. Related Vulnerabilities

Same product: heimdall
Same vendor: dadrus
Same weakness: CWE-20

V. Comments for CVE-2026-57209

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