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CVE-2026-91987

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

CVSS 4.0 7.1 HIGHCVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-91987

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-91987

Published

atomic-agents-stack

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "dep0we",
                    "product": "atomic-agents-stack",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/atomic-agents-stack",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "1.1.0"
                        },
                        {
                            "version": "1.1.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON