CVE-2026-91988

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductAtomic-agents-stack

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-319CWE-319

How to fix

Update

atomic-agents-stack1.1.0 or later

Vendor advisories

github.com/dep0we/atomic-agents-stack/security/advisories/GHSA-xhcr-cqfr-m3hv

Affected products

Product	Affected versions	Fixed in
atomic-agents-stackPyPI	v < 1.1.0	1.1.0

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