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Atomic Agents Stack CVE-2026-91988

| EUVDEUVD-2026-78659 CRITICAL
Cleartext Transmission of Sensitive Information (CWE-319)
2026-09-15 VulnCheck GHSA-wr36-693x-8mgc
9.2
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.2 CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

5
POC Analysis Generated
Sep 15, 2026 - 19:23 vuln.today
Source Code Evidence Fetched
Sep 15, 2026 - 16:06 vuln.today
Analysis Generated
Sep 15, 2026 - 16:06 vuln.today
Patch available
Sep 15, 2026 - 16:03 EUVD
CVE Published
Sep 15, 2026 - 15:18 cve.org
CRITICAL 9.2

DescriptionCVE.org

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.

Analysis

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.

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CVE-2026-91988 vulnerability details – vuln.today

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