CVE-2026-56742
Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
Cilium 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.
| CWE | CWE-862 |
| Vendor | cilium |
| Product | cilium |
| Published | Jul 15, 2026 |
| Last Updated | Jul 16, 2026 |
Stay Ahead of the Next One
Get instant alerts for cilium cilium
Be the first to know when new medium vulnerabilities affecting cilium cilium are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low
Affected Versions
cilium / cilium
< 1.17.17 >= 1.18.0, < 1.18.11 >= 1.19.0, < 1.19.5
References
github.com: https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj github.com: https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb github.com: https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857 github.com: https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b github.com: https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca github.com: https://github.com/cilium/cilium/releases/tag/v1.17.17 github.com: https://github.com/cilium/cilium/releases/tag/v1.18.11 github.com: https://github.com/cilium/cilium/releases/tag/v1.19.5