CVE-2026-26963CWE-863

Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled

Medium · published February 19, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
7.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00183 · 7.5th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-02-19T23:38Z
EPSS history
Timeline
  • 19 FEB 23:38Z
    Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled
    cvelistv5