Unauthenticated Server-Side RCE via PythonCodeStructuredTool in Public Flows (CVE-2026-10134) | HOL Guard CVE

Critical · CVSS 10.0CVE-2026-10134

Unauthenticated Server-Side RCE via PythonCodeStructuredTool in Public Flows

Answer in brief

CVE-2026-10134 records a Critical severity (CVSS 10.0) vulnerability in Unauthenticated Server-Side RCE via PythonCodeStructuredTool in Public Flows. The current sources do not mark it as known exploited. The current feed maps IBM/Langflow OSS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 30, 2026Updated Jul 2, 2026Source checked Sep 19, 2026First seen by HOL Jun 30, 2026Material review Jul 2, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 10.0
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 10.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/Langflow OSS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
IBM/Langflow OSSgeneric	1.0.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for IBM/Langflow OSS.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 30, 2026

Sources and claim methodology

Source referenceibm.com

Upstream source description

IBM Langflow OSS 1.0.0 through 1.9.3 allows an attacker to read every secret available to the Langflow process, read and modify every flow, conversation, message, file upload, and saved component in the Langflow database, can connect to internal services, abuse cloud metadata endpoints, laterally move to other tenants on the same Langflow instance, and Establish persistence by modifying the public flow's `tool_code` so normal `/api/v1/build/...` calls by any user re-execute attacker code at each build.

Quoted source text, attributed separately from HOL analysis.