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CVE-2026-26963— Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled

Quick assessment

Affected
cilium cilium
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cilium是Cilium开源的一个开源软件。用于提供和透明地保护应用程序工作负载（如应用程序容器或进程）之间的网络连接和负载平衡。 Cilium 1.18.0版本至1.18.5版本存在安全漏洞，该漏洞源于启用原生路由、WireGuard和节点加密时错误允许来自其他节点Pod的流量，可能导致网络策略绕过。

CVSS 6.1 · Medium EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-26963

Vulnerability Information
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Vulnerability Title
Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Cilium 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cilium是Cilium开源的一个开源软件。用于提供和透明地保护应用程序工作负载（如应用程序容器或进程）之间的网络连接和负载平衡。 Cilium 1.18.0版本至1.18.5版本存在安全漏洞，该漏洞源于启用原生路由、WireGuard和节点加密时错误允许来自其他节点Pod的流量，可能导致网络策略绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cilium cilium >= 1.18.0, < 1.18.6 -

II. Public POCs for CVE-2026-26963

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III. Intelligence Information for CVE-2026-26963

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IV. Related Vulnerabilities

Same product: cilium
Same vendor: cilium
Same weakness: CWE-863

V. Comments for CVE-2026-26963

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