Answer in brief
CVE-2026-91987 records a High severity (CVSS 6.5) vulnerability in atomic-agents-stack before 1.1.0 Cost Guardrail Bypass via Unknown Model. The current sources do not mark it as known exploited. The current feed maps dep0we/atomic-agents-stack (generic), atomic-agents-stack (pip), atomic-agents-stack (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps dep0we/atomic-agents-stack (generic), atomic-agents-stack (pip), atomic-agents-stack (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| dep0we/atomic-agents-stackgeneric | >=0 <1.1.0 | 1.1.0 |
| atomic-agents-stackpip | <=1.0.0 | 1.1.0 |
| atomic-agents-stackpypi | >=0 <1.1.0 | 1.1.0 |
Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 17, 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.
Quoted source text, attributed separately from HOL analysis.