SB2026110950 - Incorrect authorization in Cilium

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Main Vulnerability Database SB2026110950

SB2026110950 - Incorrect authorization in Cilium

Published: November 9, 2026

Security Bulletin ID SB2026110950
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
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-2026-104149)

CWE-ID: CWE-863 - Incorrect Authorization

CVSSv4: 6.9 [CVSS:4.0/AV:N/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 remote attacker to bypass Cilium ingress host policies and L7 network policies to reach protected pods.

The vulnerability exists due to incorrect packet classification that skips policy enforcement when TCX attachment is enabled and Cilium attaches to both a VLAN interface and its parent. An unauthenticated remote attacker can send traffic from outside an affected node to targeted pods and establish connections that those policies should deny.


Remediation

Install update from vendor's website.

References