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GO-2026-6367
Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match in github.com/cilium/cilium
Quick fix
GO-2026-6367 — github.com/cilium/cilium: upgrade to the fixed version with the command below.
go get github.com/cilium/cilium@v1.19.5Details
Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match in github.com/cilium/cilium
Are you affected?
Enter the version of the package you're using.
Affected packages
Go/github.com/cilium/cilium
Introduced in:
1.19.0Fixed in: 1.19.5Fix
go get github.com/cilium/cilium@v1.19.5References
- https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r[ADVISORY]
- https://nvd.nist.gov/vuln/detail/CVE-2026-56743[ADVISORY]
- https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8[FIX]
- https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171[FIX]
- https://github.com/cilium/cilium/pull/46305[FIX]
- https://github.com/cilium/cilium/pull/46456[FIX]
- https://github.com/cilium/cilium/releases/tag/v1.19.5[WEB]