CVE-2026-76239: Eidetic-Labs Stigmem-Node

Medium severity, CVSS 6.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Stigmem before 0.9.0a11 fails to validate the delivery_address parameter when creating webhook subscriptions, allowing authenticated users to specify internal loopback and private network destinations. Attackers can trigger matching fact-change events to cause the Stigmem server to issue server-side HTTP POST requests to internal services, enabling blind SSRF attacks against localhost and private network endpoints.

Affected products

• Eidetic-Labs Stigmem-Node: before 0.9.0a11 (fixed in 0.9.0a11)

Published 2026-08-19. Last modified 2026-09-24.