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CVE-2026-8859

Langflow path traversal

9.9 CRITICALEPSS 0.56%
  1. Published17 Jul 2026

Description

IBM Langflow OSS 1.0.0 through 1.10.0 Langflow could allow an attacker to write arbitrary files to unintended locations due to improper input validation in the APIRequest component. A path traversal vulnerability exists when the "Save to File" feature is enabled, where filenames extracted from HTTP response Content-Disposition headers are not sanitized before being joined to the temporary directory path. An attacker controlling an external HTTP server can supply crafted filename values containing path traversal sequences (e.g., ../), enabling arbitrary file writes to locations accessible by the Langflow process.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Langflow≥ 1.0.0 < 1.10.1

Remediation

Fixed in
Langflow≥ 1.10.1

References

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Frequently asked

Is CVE-2026-8859 being actively exploited?

CVE-2026-8859 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.56%.

How severe is CVE-2026-8859?

CVE-2026-8859 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.56% probability of exploitation.

Which products are affected by CVE-2026-8859?

Affected products include Langflow.

How do I fix CVE-2026-8859?

Upgrade affected software to a fixed version, for example Langflow 1.10.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-8859 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.