CVE-2026-26963 | THREATINT

Description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6.

PUBLISHED Reserved 2026-02-16 | Published 2026-02-19 | Updated 2026-02-20 | Assigner GitHub_M

MEDIUM: 6.1CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

>= 1.18.0, < 1.18.6

affected

References

github.com/...cilium/security/advisories/GHSA-5r23-prx4-mqg3

github.com/cilium/cilium/pull/42892

github.com/...ommit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885

github.com/cilium/cilium/releases/tag/v1.18.6

cve.org (CVE-2026-26963)

nvd.nist.gov (CVE-2026-26963)

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