Unleash is an open-source feature management platform

Overview

Unleash is an open-source feature management platform. Prior to 7.5.2, 7.6.5, and 8.0.2, the addon and integration subsystem passes the operator-controlled parameters.url value from src/lib/addons/webhook.ts and the Slack, Microsoft Teams, Datadog, and New Relic integrations to Addon.fetchRetry in src/lib/addons/addon.ts without restricting loopback, link-local, private, or cloud metadata addresses. An authenticated actor with the root CREATE_ADDON or UPDATE_ADDON permission can cause the server to send requests from inside its network boundary, use integration event status as a blind probing oracle, forward Authorization, customHeaders, or DD-API-KEY values to an attacker-observed host, and deliver the feature-event JSON body to internal services. This issue is fixed in versions 7.5.2, 7.6.5, and 8.0.2.

Remediation

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

Package advisory (CVE-2026-63004)

Affected packages:

• unleash-server < 7.5.2
• unleash-server >= 7.6.0, < 7.6.5
• unleash-server >= 8.0.0, < 8.0.2

Patched in:

• unleash-server 7.5.2
• unleash-server 7.6.5
• unleash-server 8.0.2

Source: https://github.com/advisories/GHSA-5vf6-jrqr-78fj