Is github.com/cilium/cilium affected by CVE-2026-26963?

Go github.com/cilium/cilium is affected in >=1.18.0 <1.18.6.

Is CVE-2026-26963 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.1%.

medium

CVE-2026-26963

Q: Is CVE-2026-26963 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.1%.

Go · github.com/cilium/cilium

Summary

Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled in github.com/cilium/cilium

Severity: medium
EPSS: 0.1% (p3)
Also known as: GHSA-5r23-prx4-mqg3, BIT-cilium-2026-26963, BIT-cilium-operator-2026-26963, BIT-hubble-relay-2026-26963, GO-2026-4522
Published: 2026-02-23

References

https://github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3
https://nvd.nist.gov/vuln/detail/CVE-2026-26963
https://github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885

Related advisories

CVE-2026-41520 — high · Go/github.com/cilium/cilium
CVE-2026-33726 — medium · Go/github.com/cilium/cilium
CVE-2025-64715 — medium · Go/github.com/cilium/cilium

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.