CVE-2026-91987
atomic-agents-stack before 1.1.0 Cost Guardrail Bypass via Unknown Model
- State
- Published
- Severity
- 7.1 High
- Published
- Sep 15, 2026
- Updated
- Sep 17, 2026
- Reserved
- Sep 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
atomic-agents-stackdep0we |
|
References
- GitHub Security Advisory (GHSA-j659-8xh6-5pq5)vendor-advisory
- VulnCheck Advisory: atomic-agents-stack before 1.1.0 Cost Guardrail Bypass via Unknown Modelthird-party-advisory
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