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CVE-2026-56743— Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match

CVSS 5.4 · Medium EPSS 0.16% · P5

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
ciliumcilium>= 1.19.0, < 1.19.5affected
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I. Basic Information for CVE-2026-56743

Vulnerability Information
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Vulnerability Title
Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match
Source: NVD (National Vulnerability Database)
Vulnerability Description
Cilium is a networking, observability, and security solution. From 1.19.0 to 1.19.4, standard Kubernetes NetworkPolicy specifications using CIDR-based ipBlock rules without pod or namespace selectors erroneously generate a wildcard namespace allow rule when Cilium is configured with a custom clusterName rather than the default any value. The parser incorrectly instantiates a pod selector on selectorless peer definitions, allowing traffic from other workloads in the same namespace as the subject of the policy. This issue is fixed in version 1.19.5.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cilium 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cilium是Cilium组织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 1.19.0版本至1.19.4版本存在授权问题漏洞，该漏洞源于解析器在无选择器对等定义上错误实例化pod选择器，导致CIDR-based ipBlock规则的Kubernetes NetworkPolicy规范在Cilium配置自定义clusterName时错误生成通配符命名空间允许规则，允许来自同一命名空间其他工作负载的流量。
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

VendorProductAffected VersionsCPESubscribe
ciliumcilium >= 1.19.0, < 1.19.5 -

II. Public POCs for CVE-2026-56743

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III. Intelligence Information for CVE-2026-56743

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Patches & Fixes for CVE-2026-56743 (3)

Vendor Advisories for CVE-2026-56743 (1)

Vendor Pages for CVE-2026-56743 (1)

Same Patch Batch · cilium · 2026-07-15 · 3 CVEs total

CVE-2026-494459.2 CRITICALCilium: Sensitive information disclosure and cluster disruption via local Envoy admin sock
CVE-2026-567425.9 MEDIUMCilium: Namespaced HTTPRoutes can redirect traffic to other namespaces

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-56743

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