Vulnerability details

CVE-2026-91987

dep0we atomic-agents-stack

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

CVSS 4.0

7.1High

Official 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.

CVSS scores

Score	Version	Source	Vector
7.1High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`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`
6.5Medium	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
dep0we	atomic-agents-stack	v < 1.1.0	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-09-15
Last updated: 2026-09-17
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.47%

Probability of exploitation in 30 days

41.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-770
Allocation of Resources Without Limits or Throttling