# CVE-2026-91988

## Summary

- **CVE ID:** CVE-2026-91988
- **Severity:** CRITICAL
- **CVSS Score:** 9.2 (CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-319
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## Description

atomic-agents-stack before 1.1.0 accepts cleartext HTTP schemes in the HTTP MCP server-registry backend factory, allowing network man-in-the-middle attackers to rewrite catalog responses. Attackers can inject arbitrary command and argument values that are spawned as local subprocesses by MCPClientPool to achieve code execution on the agent host.

## Affected Products

- dep0we — atomic-agents-stack (0)
- dep0we — atomic-agents-stack (1.1.0)

## References

- [CNA](https://github.com/dep0we/atomic-agents-stack/security/advisories/GHSA-xhcr-cqfr-m3hv)
- [CNA](https://www.vulncheck.com/advisories/atomic-agents-stack-before-1.1.0-remote-code-execution-via-http-mcp)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 16.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._