Secuno
ENNL
Book demo

CVE-2026-55446

Langflow denial of service

7.5 HIGHPublic exploitEPSS 0.58%
  1. Published23 Jun 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Langflow< 1.0.19

Remediation

Fixed in
Langflow≥ 1.0.19

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-904418.1
A missing authorization vulnerability in the wgagent management daemon's session…
CVE-2026-866088.2
The WP Recipe Maker WordPress plugin before 10.8.2 does not have any authorisation…
CVE-2026-143218.2
The divi-dash WordPress plugin before 1.0.7 does not validate the source of the client…
CVE-2026-336258.8
LMDeploy is a toolkit for compressing, deploying, and serving large language models.…
CVE-2026-834658.2
Vulnerability in the Oracle Mobile Application Server product of Oracle E-Business…
CVE-2026-834578.1
Vulnerability in the Oracle Demand Signal Repository product of Oracle E-Business Suite…

Frequently asked

Is CVE-2026-55446 being actively exploited?

CVE-2026-55446 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.58%.

How severe is CVE-2026-55446?

CVE-2026-55446 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.58% probability of exploitation.

Which products are affected by CVE-2026-55446?

Affected products include Langflow.

How do I fix CVE-2026-55446?

Upgrade affected software to a fixed version, for example Langflow 1.0.19 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-55446 against the real software inventory on every managed device, as each hourly inventory arrives. 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.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

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