Vulnerability DatabaseCVE-2026-91987
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CVE-2026-91987
Published:September 15, 2026
Updated:October 13, 2026
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.
Affected Packages
atomic-agents-stack (PYTHON):
Affected version(s) =1.0.0 <1.1.0
Fix Suggestion:
Update to version 1.1.0
Related Resources (6)
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91987.json
https://www.vulncheck.com/advisories/atomic-agents-stack-before-1.1.0-cost-guardrail-bypass-via-unknown-model
https://github.com/dep0we/atomic-agents-stack
https://nvd.nist.gov/vuln/detail/CVE-2026-91987
https://github.com/dep0we/atomic-agents-stack/releases#release-v1.1.0
https://github.com/dep0we/atomic-agents-stack/security/advisories/GHSA-j659-8xh6-5pq5
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CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
CWE-770
EPSS
Base Score:
0.48