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archive/Patch now/AIR-2026-1231
closedclosed 30 Jul 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-13435: IBM Langflow OSS PythonREPL Sandbox Input Validation Flaw

Langflow

IBM Langflow OSS has an input validation vulnerability within its PythonREPL sandbox implementation. The vendor has disclosed the issue for patching without confirmed exploitation.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
9.9
EPSS
0.01 · top 55% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
30 Jul 2026
last update
30 Jul 2026
CVE ids
CVE-2026-13435other records

Timeline · 1

  1. 30 Jul 2026CVE-2026-13435: IBM Langflow OSS 1.0.0 through 1.10.1 contains an improper input validation vulnerability in the PythonREPL sandbox…

Sources · 1

Advisories and databases

  1. 2026-07-30
    CVE-2026-13435: IBM Langflow OSS 1.0.0 through 1.10.1 contains an improper input validation vulnerability in the PythonREPL sandbox…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-13435

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Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
sandbox-escape
dates
happened 30 Jul 2026 · first reported 30 Jul 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-13435: IBM Langflow OSS PythonREPL Sandbox Input Validation Flaw

https://gcdradar.vercel.app/incidents/cve-2026-13435-ibm-langflow-oss-pythonrepl-sandbox-input-val · AIR-2026-1231 · closed 2026-07-30

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-07-30
- AI role: Attack on AI
- Products: Langflow
- CVE ids: CVE-2026-13435
- CVSS: 9.9

## Summary

IBM Langflow OSS has an input validation vulnerability within its PythonREPL sandbox implementation. The vendor has disclosed the issue for patching without confirmed exploitation.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-07-30: CVE-2026-13435: IBM Langflow OSS 1.0.0 through 1.10.1 contains an improper input validation vulnerability in the PythonREPL sandbox… (https://nvd.nist.gov/vuln/detail/CVE-2026-13435)

## Sources

- 2026-07-30 NVD: CVE-2026-13435: IBM Langflow OSS 1.0.0 through 1.10.1 contains an improper input validation vulnerability in the PythonREPL sandbox… https://nvd.nist.gov/vuln/detail/CVE-2026-13435

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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