Auth bypass in Cilium
CVE-2026-56743
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 namespa…
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Cilium — versions >= 1.19.0, < 1.19.5
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-56743?
- CVE-2026-56743 is a medium-severity vulnerability in Cilium, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-07-15.
- How severe is CVE-2026-56743?
- Medium severity. CVSS v3 base score is 5.4 out of 10.