Medium severity6.5NVD Advisory· Published Sep 15, 2026· Updated Sep 24, 2026

CVE-2026-91987

Description

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.

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References

github.com/dep0we/atomic-agents-stack/security/advisories/GHSA-j659-8xh6-5pq5nvd
www.vulncheck.com/advisories/atomic-agents-stack-before-1.1.0-cost-guardrail-bypass-via-unknown-modelnvd

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