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CVE-2026-19596— OpenNMS XML collector XXE allows arbitrary file read from the OpenNMS host

Quick assessment

Affected
The OpenNMS Group Meridian
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

多个版本的 OpenNMS Meridian 和 Horizon 中的 XML 采集器存在 XML 外部实体（XXE）漏洞。当 OpenNMS 从攻击者可控制的来源（例如已被攻陷的被监控主机，或处于 HTTP 中间人攻击位置的来源）采集 XML 时，采集器的 XML 解析器会解析外部实体和外部 DTD。这使得攻击者能够读取 OpenNMS 服务账户可访问的文件（包括数据库凭证），并触发带外（out-of-band）请求。 解决方案是升级至 Meridian 2024.3.13、2025.0.10 或更新版本，以及

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-19596

Vulnerability Information
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Vulnerability Title
OpenNMS XML collector XXE allows arbitrary file read from the OpenNMS host
Source: CVE Program / CVE List V5
Vulnerability Description
An XML External Entity (XXE) vulnerability exists in the XML collector of multiple versions of OpenNMS Meridian and Horizon. When OpenNMS collects XML from a source whose response is attacker-controlled (for example a compromised monitored host or an HTTP man-in-the-middle position), the collector's XML parser resolves external entities and external DTDs. This allows an attacker to read files accessible to the OpenNMS service account, including database credentials, and to induce out-of-band requests. The solution is to upgrade to Meridian 2024.3.13, 2025.0.10 and Horizon 36.0.4 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The OpenNMS Group Meridian 2024.1.0 ~ 2024.3.13 -
The OpenNMS Group Horizon 36.0.0 ~ 36.0.4 -

II. Public POCs for CVE-2026-19596

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III. Intelligence Information for CVE-2026-19596

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Patches & Fixes for CVE-2026-19596 (1)

Same Patch Batch · The OpenNMS Group · 2026-09-10 · 3 CVEs total

CVE-2026-89054 8.2 HIGH OpenNMS missing authorization on /api/v2 PATCH endpoints allows unauthenticated configurat
CVE-2026-89089 6.5 MEDIUM OpenNMS SQL injection in shipped Asset Management JasperReports via the DATE_FORMAT parame

IV. Related Vulnerabilities

Same product: Meridian
Same vendor: The OpenNMS Group
Same weakness: CWE-611

V. Comments for CVE-2026-19596

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