CVE-2026-91987

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductAtomic-agents-stack

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-770Allocation of resources without limits

How to fix

Update

atomic-agents-stack1.1.0 or later

Vendor advisories

github.com/dep0we/atomic-agents-stack/security/advisories/GHSA-j659-8xh6-5pq5

Affected products

Product	Affected versions	Fixed in
atomic-agents-stackPyPI	v < 1.1.0	1.1.0

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