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Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') Affecting opensearch-dashboards-3 package, versions <3.8.0-r5

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.27% (19th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-OPENSEARCHDASHBOARDS3-19757620
  • published13 Sept 2026
  • disclosed1 Sept 2026
Report a new vulnerability Found a mistake?

Introduced: 1 Sep 2026

NewCVE-2026-84367  (opens in a new tab)
CWE-1321  (opens in a new tab)

How to fix?

Upgrade Chainguard opensearch-dashboards-3 to version 3.8.0-r5 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream opensearch-dashboards-3 package and not the opensearch-dashboards-3 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

joi is a schema description language and data validator for JavaScript. From 16.0.0 until 17.13.5 and 18.2.4, joi's lib/types/keys.js internals.rename() implementation used by object().rename() permits a schema that renames keys with a regular-expression source and a Joi.expression() or Joi.x() target that interpolates the pattern's own match data, combined with { multiple: true }, to derive a target from an attacker-controlled input key. An attacker can send x-proto with an object value, causing the target to render as proto and set the prototype of the object returned by validate() instead of creating an own key. The global Object.prototype is not modified, so the effect is confined to the object returned by that validation call. Static-string targets and schemas using the default { multiple: false } are not affected. This issue is fixed in versions 17.13.5 and 18.2.4.