Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces

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Summary

CVECVE-2026-56742
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-15 20:17:51 UTC
Updated2026-07-16 14:16:55 UTC
DescriptionCilium is a networking, observability, and security solution. Prior to 1.17.17, 1.18.11, and 1.19.5, Cilium clusters using Gateway API allow users with permissions to create or update namespaced HTTPRoutes to mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant authorization mechanism. Gateway API functionality is disabled by default. This issue is fixed in versions 1.17.17, 1.18.11, and 1.19.5.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

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

Problem Types: CWE-862 | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cilium Cilium affected < 1.17.17 Not specified
CNA Cilium Cilium affected >= 1.18.0, < 1.18.11 Not specified
CNA Cilium Cilium affected >= 1.19.0, < 1.19.5 Not specified

References

ReferenceSourceLinkTags
github.com/cilium/cilium/releases/tag/v1.19.5 [email protected] github.com
github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b [email protected] github.com
github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb [email protected] github.com
github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857 [email protected] github.com
github.com/cilium/cilium/releases/tag/v1.17.17 [email protected] github.com
github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj [email protected] github.com
github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca [email protected] github.com
github.com/cilium/cilium/releases/tag/v1.18.11 [email protected] github.com
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