CVE-2026-26963
MEDIUMCilium 1.18.0-1.18.5 - Incorrect Authorization via Native Routing with WireGuard and Node Encryption
Title source: llmDescription
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.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_confirm
https://github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3
Issue Tracking x_refsource_misc
https://github.com/cilium/cilium/pull/42892
Patch x_refsource_misc
https://github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885
Release Notes x_refsource_misc
https://github.com/cilium/cilium/releases/tag/v1.18.6
Scores
CVSS v3
6.1
EPSS
0.0001
EPSS Percentile
0.4%
Attack Vector
ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-863
Status
published
Products (2)
cilium/cilium
1.18.0 - 1.18.6Go
cilium/cilium
1.18.0 - 1.18.6
Published
Feb 20, 2026
Tracked Since
Feb 20, 2026