CVE-2026-7528Public exploitNetwork attack vector

Disk exhaustion via unauthenticated unrestricted uploads

Published May 27, 2026 · Updated May 27, 2026

Uncontrolled resource consumption in Langflow OSS 1.0.0 through 1.9.0 allows remote attackers to exhaust server disk space. The deprecated POST /api/v1/upload/{flow_id} route accepts unauthenticated files and arbitrary UUIDs, omits a size limit, writes content to the cache, and returns its absolute path. Network access alone permits repeated uploads until storage pressure interrupts service, while each successful response discloses the server cache path.

CVSS severity9.3
Critical
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Langflow OSS 1.0.0 through 1.9.0 allows remote attackers to exhaust server disk space. The deprecated POST /api/v1/upload/{flow_id} route accepts unauthenticated files and arbitrary UUIDs, omits a size limit, writes content to the cache, and returns its absolute path. Network access alone permits repeated uploads until storage pressure interrupts service, while each successful response discloses the server cache path.

The record

CVE
CVE-2026-7528
Published
May 27, 2026
Updated
May 27, 2026
Vendor
OpenBMC Project
Product
Langflow OSS
Classifications
CWE-306, CWE-200, CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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 <=1.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenBMC Project · Langflow OSSversion=1.0.0 <=1.9.0

Published CVSS scores

9.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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