CVE-2026-91987

MEDIUM 6.5

atomic-agents-stack before 1.1.0 Cost Guardrail Bypass via Unknown Model

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	dep0we
Product	atomic-agents-stack
Published	Sep 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

dep0we / atomic-agents-stack

0 < 1.1.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/dep0we/atomic-agents-stack/security/advisories/GHSA-j659-8xh6-5pq5 vulncheck.com: https://www.vulncheck.com/advisories/atomic-agents-stack-before-1.1.0-cost-guardrail-bypass-via-unknown-model