GHSA-j659-8xh6-5pq5

Source

https://github.com/advisories/GHSA-j659-8xh6-5pq5

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-j659-8xh6-5pq5/GHSA-j659-8xh6-5pq5.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-j659-8xh6-5pq5

Aliases

CVE-2026-91987

Published

2026-08-17T21:50:01Z

Modified

2026-09-16T03:56:06Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

atomic-agents-stack: Parallel helper/delegate batch reserves $0 for models absent from the pricing table, bypassing the cost-cap fan-out guard

Details

_estimate_batch_cost (atomic_agents/agent.py) looks up the per-model output price with PRICING.get(model, {}), returning 0.0 for any model not in the hardcoded pricing table. _check_batch_reservation then early-returns when the reservation is <= 0, skipping the batch reservation entirely. That reservation is the only defense against the documented fan-out race where every parallel helper/delegate reads the identical pre-batch on-disk cost total and each passes its individual check even though the collective spend overruns the configured cap.

Impact: an operator running any model not in the pricing table (self-hosted/Ollama/vLLM, a new provider SKU) with cost_guardrails + daily_cap_usd set believes the cap protects them, but a single parallel batch can blow past the cap. The parallel-helper model argument can also be steered to an unknown id. The sibling dream._estimate_dream_cost does this correctly (PRICING.get(model, _fallback_pricing())), which makes this a clear defect.

Affected: agent.py (_estimate_batch_cost / _check_batch_reservation), all versions through 1.0.0.

Fix: use PRICING.get(model, _costs._fallback_pricing())['output'] (mirror dream/calc_cost). Add a conformance test asserting an unknown-model batch reserves > 0 and that an over-cap unknown-model batch raises CostGuardrailBlocked.

Database specific

{
    "cwe_ids":  [
        "CWE-770"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-17T21:50:01Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}

References

Affected packages

PyPI / atomic-agents-stack

Package

Name: atomic-agents-stack; View open source insights on deps.dev
Purl: pkg:pypi/atomic-agents-stack

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.1.0

Affected versions

1.*

1.0.0

Database specific

last_known_affected_version_range

"<= 1.0.0"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-j659-8xh6-5pq5/GHSA-j659-8xh6-5pq5.json"