CVE-2026-91987

MEDIUMCVSS 6.5

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.

Timeline

Published:September 15th, 2026 4:17 PM

Last modified:September 24th, 2026 8:48 PM

CVSS Scoring

CVSS v3: 6.5 (MEDIUM)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-770

References & Reports

Advisories, patches, and third-party reports

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

Source: NIST NVD · Data may lag official sources by up to one minute