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Advisory record · GHSA-j659-8xh6-5pq5

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

CVSS 7.1 HighEPSS 0.0048 · 41st percentile

Published by the GitHub Advisory Database at 17 Aug 2026, 21:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
atomic-agents-stackPyPI<1.1.01.1.0
Identifiers
GHSA-j659-8xh6-5pq5 · CVE-2026-91987
Weakness (CWE)
CWE-770
Tags
Published
17 Aug 2026
Updated
16 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The atomic-agents-stack package before 1.1.0 can skip its cost-cap reservation for parallel helper or delegate batches when the model is missing from its hardcoded pricing table, so a batch can exceed a configured daily cap. An operator who uses an unlisted model, such as a self-hosted or new provider model, with cost guardrails and a daily cap set can be overrun by one parallel batch. Upgrade to atomic-agents-stack 1.1.0 or later. The source gives no other workaround.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.1 High 4.0 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 CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0048, the 41st percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:10 UTC First seen by agentprime
  2. 31 Oct 2026, 14:10 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.