PT-2026-60282 · Cilium · Cilium

Published 2026-07-15 · Updated 2026-07-15 · CVE-2026-56743

Mitre

CVSS v3.1

5.4

Medium

Base vector

AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

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.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-56743

Affected Products

Cilium

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-56743 · Security Note
• https://github.com/cilium/cilium/pull/46305 · Note
• https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171 · Note
• https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8 · Note
• https://github.com/cilium/cilium/pull/46456 · Note
• https://github.com/cilium/cilium/releases/tag/v1.19.5 · Note
• https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r · Note