CVE-2026-56743Cilium is a networking, observability, and security solution.
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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.
- CVSS
- 5.4 MEDIUM (v3.1, NVD)CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cilium cilium cilium:cilium | from 1.19.0 before 1.19.5 | NVD |
References
- https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8patch
- https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171patch
- https://github.com/cilium/cilium/pull/46305patch
- https://github.com/cilium/cilium/pull/46456patch
- https://github.com/cilium/cilium/releases/tag/v1.19.5release-notes
- https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7rvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.