CVE-2026-91987: DEP0WE Atomic-Agents-Stack

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

atomic-agents-stack before 1.1.0 contains a cost-guardrail bypass in the _estimate_batch_cost function that returns zero cost for unknown models not in the pricing table. Attackers can configure deployments with unknown model identifiers to bypass daily cost caps and exceed budget limits in parallel batch operations.

Affected products

• DEP0WE Atomic-Agents-Stack: before 1.1.0 (fixed in 1.1.0)

Published 2026-09-15. Last modified 2026-09-24.