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Cilium: security advisories, deprecations and releases

eBPF-based networking, security and observability for Kubernetes.

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CRITICAL ACT BY 30 JUN 2025 Cilium releases · 23 Oct 2026

Cilium 1.18.16 security patch release

Out-of-band release upgrades Go to 1.26.10 to remove trust for compromised eMudhra intermediate CA certificates and fixes CiliumEnvoyConfig namespace handling.

CVE-2026-111943

Also covered by Cilium releases , Cilium releases
HIGH Cilium releases · 3 Oct 2026

Fix for terminating UDP backends

UDP connections now keep terminating backends during pod deletion and rolling updates, preventing packet drops.

HIGH NEW THIS WEEK Cilium releases · 3 Nov 2026

Enable BPF masquerading by default

BPF masquerading is now enabled by default; Cilium will masquerade pod traffic with node IP.
INFO Cilium releases · 23 Oct 2026

Cilium 1.19.10 released

New patch release of Cilium with updates and fixes.
INFO Cilium releases · 15 Oct 2026

Cilium 1.18.15 released

Cilium 1.18.15 is available with the usual bug fixes and maintenance updates.
INFO Cilium releases · 15 Oct 2026

Cilium 1.19.9 released

Cilium 1.19.9 is now available on GitHub.

MEDIUM tl;dr sec · 3 Oct 2026

CiliumHound: Graphing Kubernetes Network Policies

BloodHound OpenGraph extension that ingests Cilium network policies and creates searchable graphs to audit L3/L4/L7 rules and identify policy gaps.

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