CVE-2026-19286Network attack vectorHinoki check available

Unauthenticated code execution via unguarded A2A flow

Published Aug 28, 2026 · Updated Aug 28, 2026

Code injection in IBM Langflow OSS 1.0.0 through 1.11.1 allows remote attackers to execute arbitrary Python through a public A2A endpoint. The A2A JSON-RPC execution path omits validate_public_flow_no_code_execution, so an agent flow's stored Python runs in the backend process. Exploitation requires A2A to be enabled and an auth_type=none agent flow to be published; successful code runs with the server process's privileges.

CVSS severity9.8
Critical
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Code injection in IBM Langflow OSS 1.0.0 through 1.11.1 allows remote attackers to execute arbitrary Python through a public A2A endpoint. The A2A JSON-RPC execution path omits validate_public_flow_no_code_execution, so an agent flow's stored Python runs in the backend process. Exploitation requires A2A to be enabled and an auth_type=none agent flow to be published; successful code runs with the server process's privileges.

The record

CVE
CVE-2026-19286
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-94, T1190, T1059.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <=1.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Langflow OSSversion=1.0.0 <=1.11.1

Published CVSS scores

9.8IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application
T1059.006Python

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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