CVE-2026-53935
Medium
Description
Cilium is a networking, observability, and security solution. Prior to 1.17.16, from 1.18.2 to 1.18.9, and from 1.19.0 to 1.19.3, users with the ability to create CiliumLocalRedirectPolicies can specify arbitrary ClusterIPs via addressMatcher, enabling hijacking traffic to Services in any namespace and bypassing namespace scoping enforced by serviceMatcher; deleting such a policy can also corrupt Cilium internal service state and stop service translation for the affected Service. This issue is fixed in versions 1.17.16, 1.18.10, and 1.19.4.
SeverityMedium
CVSS6.9
Exploit probability—
ProductGithub.com/cilium/cilium
PublishedJul 7, 2026
First seenJul 7, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- github.com/cilium/cilium1.19.4, 1.18.10, 1.17.16 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/cilium/ciliumGo | 1.19.0 ≤ v < 1.19.4, 1.18.2 ≤ v < 1.18.10, v < 1.17.16 | 1.19.4, 1.18.10, 1.17.16 |
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