CVE-2026-32811

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.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/dadrus/heimdall/commit/50321b3007db1ccafdc6b1cfd6bdc3689c19a502
https://github.com/dadrus/heimdall/pull/3106
https://github.com/dadrus/heimdall/security/advisories/GHSA-r8x2-fhmf-6mxp
https://github.com/envoyproxy/envoy/blob/105b4acd422d67fcff908ec38d91c7676d079939/api/envoy/service/auth/v3/attribute_context.proto#L146-L147

Configurations

No configuration.

History

20 Mar 2026, 02:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-20 02:16

Updated : 2026-03-20 13:37

NVD link : CVE-2026-32811

Mitre link : CVE-2026-32811

CVE.ORG link : CVE-2026-32811

JSON object : View

Products Affected

No product.

CWE

CWE-116

Improper Encoding or Escaping of Output

CWE-863

Incorrect Authorization

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