CVSS 3.1
8.9 highCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:LCVE-2026-56742
High (8.9) in cilium cilium. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/cilium/cilium 1.17.17, 1.18.11, 1.19.5.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-31)
- CWE
- CWE-862
- Published
- Modified
- Record from
- the NVD, synced
Affected
- cilium:cilium
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-w7c2-w76w-5hmj | Go | github.com/cilium/cilium | <1.17.17 | 1.17.17 |
| GHSA-w7c2-w76w-5hmj | Go | github.com/cilium/ciliumCilium | >=1.18.0 <1.18.11 | 1.18.11 |
| GHSA-w7c2-w76w-5hmj | Go | github.com/cilium/cilium | >=1.19.0 <1.19.5 | 1.19.5 |
| GO-2026-6596 | Go | github.com/cilium/cilium | <1.17.17 >=1.18.0 <1.18.11 >=1.19.0 <1.19.5 | 1.17.17, 1.18.11, 1.19.5 |
References
- https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb
- https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857
- https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b
- https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca
- https://github.com/cilium/cilium/releases/tag/v1.17.17