CVE-2026-91987atomic-agents-stack before 1.1.0 Cost Guardrail Bypass via Unknown Model
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It affects dep0we atomic-agents-stack. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
dep0we atomic-agents-stack dep0we:atomic_agents_stack (from the name) | before 1.1.0; 1.1.0 not affected | CNA record |
References
- https://github.com/dep0we/atomic-agents-stack/security/advisories/GHSA-j659-8xh6-5pq5vendor-advisory
- https://www.vulncheck.com/advisories/atomic-agents-stack-before-1.1.0-cost-guardrail-bypass-via-unknown-modelthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.