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CVE-2026-91988

atomic-agents-stack before 1.1.0 Remote Code Execution via HTTP MCP

CVSS 4.0 9.2 CRITICALCVSS 3.1 8.1 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-91988

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-91988

Published

atomic-agents-stack

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "dep0we",
                    "product": "atomic-agents-stack",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/atomic-agents-stack",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "1.1.0"
                        },
                        {
                            "version": "1.1.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON