SB2026110945 - Incorrect authorization in Cilium

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Main Vulnerability Database SB2026110945

SB2026110945 - Incorrect authorization in Cilium

Published: November 9, 2026

Security Bulletin ID SB2026110945
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Incorrect authorization (CVE-ID: CVE-2026-26963)

CWE-ID: CWE-863 - Incorrect Authorization

CVSSv4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows an unauthenticated adjacent-network attacker to bypass Cilium host firewall policies and reach hosts from Pods on other nodes.

The vulnerability exists due to incorrect host policy enforcement for inter-node Pod traffic when Native Routing, WireGuard, and Node Encryption are all enabled, a non-default configuration. An unauthenticated adjacent-network attacker can send traffic from a Pod on another node and have it incorrectly permitted despite restrictive host policies.


Remediation

Install update from vendor's website.

References