dadrus heimdall up to 0.17.10 Control Decision Service /mypath?foo=bar Query escape output

Summaryinfo

A vulnerability classified as critical was found in dadrus heimdall up to 0.17.10. The impacted element is an unknown function of the file /mypath?foo=bar of the component Control Decision Service. Executing a manipulation of the argument Query can lead to escape output. This vulnerability is registered as CVE-2026-32811. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in dadrus heimdall up to 0.17.10. This vulnerability affects an unknown function of the file /mypath?foo=bar of the component Control Decision Service. The manipulation of the argument query with an unknown input leads to a escape output vulnerability. The CWE definition for the vulnerability is CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. 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. When using Heimdall in envoy gRPC decision API mode with versions 0.7.0-alpha through 0.17.10, wrong encoding of the query URL string allows rules with non-wildcard path expressions to be bypassed. Envoy splits the requested URL into parts, and sends the parts individually to Heimdall. Although query and path are present in the API, the query field is documented to be always empty and the URL query is included in the path field. The implementation uses go's url library to reconstruct the url which automatically encodes special characters in the path. As a consequence, a parameter like /mypath?foo=bar to Path is escaped into /mypath%3Ffoo=bar. Subsequently, a rule matching /mypath no longer matches and is bypassed. The issue can only lead to unintended access if Heimdall is configured with an "allow all" default rule. Since v0.16.0, Heimdall enforces secure defaults and refuses to start with such a configuration unless this enforcement is explicitly disabled, e.g. via --insecure-skip-secure-default-rule-enforcement or the broader --insecure flag. This issue has been fixed in version 0.17.11.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-32811 since 03/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

Upgrading to version 0.17.11 eliminates this vulnerability. Applying the patch 50321b3007db1ccafdc6b1cfd6bdc3689c19a502 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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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

License

• open-source

Website

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

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