Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Cilium (github.com/cilium/cilium) versions 1.16.0 through 1.16.3 are affected. When a Layer 3 and 4 allow policy uses a port range and a Layer 7 allow policy targets a port inside that range, Layer 7 enforcement may not apply to traffic the Layer 7 policy selects, so requests can be permitted on paths the Layer 7 policy was meant to restrict. Upgrade to Cilium 1.16.4. As a workaround, rewrite policies that use port ranges to list each permitted port individually.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.8 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0052, the 44th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:15 UTC First seen by agentprime
- 31 Oct 2026, 14:15 UTC Confirmed by OSV