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.

Metrics

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
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No data.

No data.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-5r23-prx4-mqg3 Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885 cve-icon cve-icon
https://github.com/cilium/cilium/pull/42892 cve-icon cve-icon
https://github.com/cilium/cilium/releases/tag/v1.18.6 cve-icon cve-icon
https://github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3 cve-icon cve-icon
History

Fri, 20 Feb 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Cilium
Cilium cilium
Vendors & Products Cilium
Cilium cilium

Fri, 20 Feb 2026 00:00:00 +0000

Type Values Removed Values Added
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.
Title Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-19T23:38:36.110Z

Reserved: 2026-02-16T22:20:28.612Z

Link: CVE-2026-26963

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-02-20T00:16:16.167

Modified: 2026-02-20T00:16:16.167

Link: CVE-2026-26963

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-20T09:53:17Z

Weaknesses