CVE-2026-91987
Received Received - Intake

Atomic Agents Stack Cost Guardrail Bypass Vulnerability

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: VulnCheck

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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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-91987
EUVD
EUVD-2026-78658

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
atomic-agents-stack atomic-agents-stack to 1.1.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

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Executive Summary

The vulnerability in atomic-agents-stack before version 1.1.0 allows attackers to bypass cost controls by using unknown model identifiers. The _estimate_batch_cost function incorrectly returns zero cost for models not listed in the pricing table, enabling deployment configurations that exceed budget limits during parallel batch operations.

Impact Analysis

This vulnerability could allow unauthorized users to deploy models without incurring costs, potentially leading to unexpected financial losses from excessive resource usage. It may also disrupt legitimate budget management and resource allocation in systems relying on cost caps.

Mitigation Strategies

Update atomic-agents-stack to version 1.1.0 or later to address the cost-guardrail bypass in the _estimate_batch_cost function. Review deployment configurations to ensure only approved model identifiers are used.

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