atomic-agents-stack before 1.1.0 Cost Guardrail Bypass via Unknown Model (CVE-2026-91987) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-91987

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

Answer in brief

CVE-2026-91987 records a Unknown severity 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). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 15, 2026Source checked Sep 15, 2026First seen by HOL Sep 15, 2026Material review Sep 15, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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.

Affected scope and exposure questions

The current feed maps dep0we/atomic-agents-stack (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
dep0we/atomic-agents-stackgeneric	>=0 <1.1.0	1.1.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for dep0we/atomic-agents-stack.
Review the reported fix. Update dep0we/atomic-agents-stack to 1.1.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 15, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.