How severe is CVE-2026-55450?

CVE-2026-55450 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2026-55450 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-55450?

CVE-2026-55450 affects Langflow. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-55450?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-55450 have an EU (EUVD) identifier?

Yes. CVE-2026-55450 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38511.

When was CVE-2026-55450 published?

CVE-2026-55450 was published on 2026-06-23 and last updated on 2026-06-24.

CVE-2026-55450

CVE-2026-55450 is a critical-severity vulnerability in Langflow with a CVSS 3.x base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38511
Weakness: CWE-200
Affected product: Langflow
Published: 2026-06-23
Last modified: 2026-06-24

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.

Frequently asked questions

What is CVE-2026-55450?: Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.
How severe is CVE-2026-55450?: CVE-2026-55450 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2026-55450 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-55450?: CVE-2026-55450 affects Langflow. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-55450?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-55450 have an EU (EUVD) identifier?: Yes. CVE-2026-55450 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38511.
When was CVE-2026-55450 published?: CVE-2026-55450 was published on 2026-06-23 and last updated on 2026-06-24.

References

Affected products (1)

cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*

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