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CVE-2026-18420— RCE via Prototype Pollution in OpenSearch Dashboards

Quick assessment

Affected
AWS Amazon OpenSearch Service
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.

OpenSearch Dashboards 中的时序数据可视化构建器（TSVB）插件存在输入验证不当的漏洞。经过身份验证的远程攻击者可通过向指标可视化 API 端点发送精心构造的 JSON 载荷，在服务器上执行任意代码。该问题属于原型污染（Prototype Pollution）漏洞的一种形式，可导致远程代码执行（RCE）。 为修复此漏洞，建议用户将 OpenSearch Dashboards 升级至 3.8 或更高版本。

CVSS 8.8 · High EPSS 0.96% · P58

Affected Version Matrix 2

VendorProduct Version RangeStatus
AWS Amazon OpenSearch Service 3.0.0< 3.8.0 affected
OpenSearch OpenSearch Dashboards 3.0.0< 3.8.0 affected
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I. Basic Information for CVE-2026-18420

Vulnerability Information
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Vulnerability Title
RCE via Prototype Pollution in OpenSearch Dashboards
Source: CVE Program / CVE List V5
Vulnerability Description
Improper input validation in the Time Series Visual Builder (TSVB) plugin in OpenSearch Dashboards allows an authenticated remote user to execute arbitrary code on the server via a crafted JSON payload to the metrics visualization API endpoint. This issue is a form of prototype pollution that enables remote code execution.  To remediate this issue, users should upgrade to OpenSearch Dashboards 3.8 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS Amazon OpenSearch Service 3.0.0 ~ 3.8.0 -
OpenSearch OpenSearch Dashboards 3.0.0 ~ 3.8.0 -

II. Public POCs for CVE-2026-18420

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III. Intelligence Information for CVE-2026-18420

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Vendor Advisories for CVE-2026-18420 (2)

Vendor Pages for CVE-2026-18420 (1)

IV. Related Vulnerabilities

Same product: Amazon OpenSearch Service
Same vendor: AWS
Same weakness: CWE-1321

V. Comments for CVE-2026-18420

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