---
id: CVE-2026-121819
title: >-
  A vulnerability has been identified in armeria-xds versions 1.40.0 through
  1.42.0, where DataSourcePolicy checks filename containment without resolving
  symbolic links, allowing a compromised or semi-trusted xDS control plane to
  cause the…
summary: >-
  A vulnerability has been identified in armeria-xds versions 1.40.0 through
  1.42.0, where DataSourcePolicy checks filename containment without resolving
  symbolic links, allowing a compromised or semi-trusted xDS control plane to
  cause the…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-59
vendor: LY Corporation
product: Armeria
affected:
  - Armeria >= 1.40 < 1.43.0
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T07:46:45.370Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121819'
references:
  - url: 'https://line.github.io/security-advisory-blog/CVE-2026-121819/'
  - url: 'https://github.com/line/armeria/security/advisories/GHSA-m64h-m6r5-6jrx'
tags:
  - cve.org
ingestedAt: '2026-11-06T08:48:01.717Z'
epss: 0.00325
epssPercentile: 0.25708
---

## Overview

A vulnerability has been identified in armeria-xds versions 1.40.0 through 1.42.0, where DataSourcePolicy checks filename containment without resolving symbolic links, allowing a compromised or semi-trusted xDS control plane to cause the xDS client to read files outside configured allowed root directories when a symbolic link inside an allowed directory points outside it. In deployments using a credential injector, header-compatible text secrets may be exposed to an attacker-observable upstream.

## Affected

- `Armeria >= 1.40 < 1.43.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.