CVE-2026-18899Network attack vectorHinoki check available

Unauthenticated file read via path traversal

Published Aug 28, 2026 · Updated Aug 28, 2026

Path traversal in IBM Langflow OSS 1.0.0 through 1.11.1 allows remote attackers to read arbitrary files through network requests. IBM has not published the affected endpoint, function, or pathname construction operation beyond identifying path traversal. No authentication or user interaction is required, and exposure is limited to files readable by the Langflow service process.

CVSS severity7.5
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Path traversal in IBM Langflow OSS 1.0.0 through 1.11.1 allows remote attackers to read arbitrary files through network requests. IBM has not published the affected endpoint, function, or pathname construction operation beyond identifying path traversal. No authentication or user interaction is required, and exposure is limited to files readable by the Langflow service process.

The record

CVE
CVE-2026-18899
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-22, T1190
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

7.5IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

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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