5.4

CVE-2026-56743

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Cilium ≫ Cilium Version >= 1.19.0 < 1.19.5
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.16% 0.054
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 5.4 2.3 2.7
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CWE-863 Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

https://github.com/cilium/cilium/releases/tag/v1.19.5
Release Notes
https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r
Vendor Advisory
https://github.com/cilium/cilium/pull/46305
Patch
https://github.com/cilium/cilium/pull/46456
Patch
https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8
Patch
https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171
Patch