How severe is CVE-2026-55446?

CVE-2026-55446 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-55446 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-55446?

CVE-2026-55446 affects Langflow. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-55446?

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

Does CVE-2026-55446 have an EU (EUVD) identifier?

Yes. CVE-2026-55446 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38515.

When was CVE-2026-55446 published?

CVE-2026-55446 was published on 2026-06-23 and last updated on 2026-06-24.

CVE-2026-55446

CVE-2026-55446 is a high-severity vulnerability in Langflow with a CVSS 3.x base score of 7.5. 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38515
Weakness: CWE-400
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 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.

Frequently asked questions

What is CVE-2026-55446?: Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.
How severe is CVE-2026-55446?: CVE-2026-55446 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-55446 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-55446?: CVE-2026-55446 affects Langflow. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-55446?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-55446 have an EU (EUVD) identifier?: Yes. CVE-2026-55446 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38515.
When was CVE-2026-55446 published?: CVE-2026-55446 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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