Heimdall: Path received via Envoy gRPC corrupted when containing query string

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Summary

CVECVE-2026-32811
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-20 02:16:34 UTC
Updated2026-03-30 15:01:22 UTC
DescriptionHeimdall 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.000310000 probability, percentile 0.087240000 (date 2026-04-01)

Problem Types: CWE-116 | CWE-863 | CWE-116 CWE-116: Improper Encoding or Escaping of Output | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Dadrus Heimdall All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Dadrus Heimdall affected >= 0.7.0-alpha, < 0.17.11 Not specified

References

ReferenceSourceLinkTags
github.com/dadrus/heimdall/commit/50321b3007db1ccafdc6b1cfd6bdc3689c19a502 [email protected] github.com Patch
github.com/dadrus/heimdall/security/advisories/GHSA-r8x2-fhmf-6mxp [email protected] github.com Exploit, Vendor Advisory
github.com/envoyproxy/envoy/blob/105b4acd422d67fcff908ec38d91c7676d07993... [email protected] github.com Patch
github.com/dadrus/heimdall/pull/3106 [email protected] github.com Issue Tracking, Patch
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