SB2026110951 - Path traversal in Cilium

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Main Vulnerability Database SB2026110951

SB2026110951 - Path traversal in Cilium

Published: November 9, 2026

Security Bulletin ID SB2026110951
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Path traversal (CVE-ID: N/A)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: 6.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows an adjacent-network attacker with low privileges to disclose local file contents outside Cilium's configured certificates directory.

The vulnerability exists due to path traversal in the secret.name field of CiliumNetworkPolicy HTTP L7 header matches using mismatch: REPLACE. An adjacent-network attacker with low privileges can use CiliumNetworkPolicy creation or modification permissions to reference a directory containing exactly one file readable by cilium-agent, causing its contents to be included in an HTTP header.


Remediation

Install update from vendor's website.

References