dadrus Heimdall up to 0.17.16 Proxy Mode input validation

Summaryinfo

A vulnerability classified as critical was found in dadrus Heimdall up to 0.17.16. Impacted is an unknown function of the component Proxy Mode. Executing a manipulation can lead to input validation. This vulnerability is tracked as CVE-2026-57209. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in dadrus Heimdall up to 0.17.16. This vulnerability affects an unknown function of the component Proxy Mode. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-57209 since 06/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 0.17.17 eliminates this vulnerability.

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Productinfo

Vendor

• dadrus

Name

• Heimdall

Version

• 0.17.0
• 0.17.1
• 0.17.2
• 0.17.3
• 0.17.4
• 0.17.5
• 0.17.6
• 0.17.7
• 0.17.8
• 0.17.9
• 0.17.10
• 0.17.11
• 0.17.12
• 0.17.13
• 0.17.14
• 0.17.15
• 0.17.16

Website

• Product: https://github.com/dadrus/heimdall/

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