CVE-2026-13435Network attack vectorHinoki check available

Sensitive data exposure via improper PythonREPL validation

Published Jul 30, 2026 · Updated Jul 30, 2026

Code injection in IBM Langflow OSS 1.0.0 through 1.10.1 allows remote authenticated users to expose sensitive data via PythonREPL. The PythonREPL sandbox improperly validates input before executing Python code, allowing code to escape its intended restrictions. IBM has not published the bypass technique or the specific data exposed; exploitation requires low-privileged network access and no user interaction.

CVSS severity9.9
Critical
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Code injection in IBM Langflow OSS 1.0.0 through 1.10.1 allows remote authenticated users to expose sensitive data via PythonREPL. The PythonREPL sandbox improperly validates input before executing Python code, allowing code to escape its intended restrictions. IBM has not published the bypass technique or the specific data exposed; exploitation requires low-privileged network access and no user interaction.

The record

CVE
CVE-2026-13435
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-94, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 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 <=1.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · Langflow OSSversion=1.0.0 <=1.10.1

Published CVSS scores

9.9IBMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.006Command and Scripting Interpreter: Python

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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