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CVE-2026-56743

MEDIUM
5.4
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-56743
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-22 19:17 UTC
Published
2026-07-15 19:15 UTC
Last updated
2026-07-15 19:15 UTC
Primary CWE
CWE-863
CWE-863: Incorrect Authorization
Vendor / Product
cilium / cilium
Sources
cve.org  ·  NVD

Severity & Metrics

5.4 MEDIUM CVSS 3.1
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Affected products (1)
VendorProductPlatformVersions
cilium cilium — >= 1.19.0, < 1.19.5
Weakness (CWE)
CWESourceDescription
CWE-863 cna CWE-863: Incorrect Authorization
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.4 MEDIUM 3.1 cna CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
References (6)
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