CVE-2026-56743

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Source
https://cve.org/CVERecord?id=CVE-2026-56743
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56743.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-56743
Aliases
  • GHSA-fm8w-2m5w-9j7r
Downstream
Published
2026-07-15T19:15:30.924Z
Modified
2026-07-18T03:41:53.399582995Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
Summary
Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56743.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/cilium/cilium

Affected ranges

Type
GIT
Repo
https://github.com/cilium/cilium
Events
Introduced
7c6667e1e707d7f39a4af3409c2a9ebea2917d32
Fixed
1c84ae3b58a7cd54f7ee355e6c524c82f620eae8
Fixed
bacea640404c0805c23515353dc1681c5bf35171
Fixed
20eaccfef029cb046d70219717fb6dbbdf27a59f
Database specific 
{
    "extracted_events": [
        {
            "introduced": "1.19.0"
        },
        {
            "fixed": "1.19.5"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

1.*
1.19.0
1.19.1
1.19.2
1.19.3
1.19.4
v1.*
v1.19.0
v1.19.1
v1.19.2
v1.19.3
v1.19.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56743.json"