CVSS 3.1
5.4 mediumCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:NCVE-2026-56743
Medium (5.4) in cilium cilium. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/cilium/cilium 1.19.5.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-31)
- CWE
- CWE-863
- Published
- Modified
- Record from
- the NVD, synced
Affected
- cilium:cilium
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-fm8w-2m5w-9j7r | Go | github.com/cilium/cilium | >=1.19.0 <1.19.5 | 1.19.5 |
| GO-2026-6367 | Go | github.com/cilium/cilium | >=1.19.0 <1.19.5 | 1.19.5 |