CVE-2025-3248· NVD / CVE Program· CNA VulnCheck

Langflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/code

Noroxi assessment

Priority: Now (action score 99/100)

CISA has confirmed exploitation in the wild (May 5, 2025); it is known to be used in ransomware campaigns. Remediation deadline for US federal agencies: May 26, 2025.
A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
Probability of exploitation in the next 30 days: 99.9% (FIRST EPSS); higher than 99.9% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: langflow-ai langflow 1.3.0.

Patch today or shut off access. Upgrade to langflow-ai langflow 1.3.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

Langflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.

CriticalCVSS 9.8 · v3.1KEVWeaponized Fix available

Published: Apr 7, 2025
Updated: Oct 8, 2026
EPSS: 99.9% · 99th percentile
CWE: CWE-306

Report tools

JSON

Action score

Now

Patch today or shut off access.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 30 / 30 · 99.9%

CISA SSVC decision

Exploitation: active
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 9.8
CNA · VulnCheck: 9.8; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on May 5, 2025. That signals real attacks, not theory.

Remediation deadline for US federal agencies: May 26, 2025.

Known to be used in ransomware campaigns.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
langflow	langflow	cpe:2.3:a:langflow:langflow

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

langflow langflowbefore 1.3.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

langflow-ai langflow
- before 1.3.0affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
PyPI	langflow	before 1.3.0	1.3.0
PyPI	langflow-base	before 0.3.0	0.3.0

Same product

langflow: all records

Other highest-scoring records for the same primary product.

CVE-2025-34291Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCEKEV
95Now
CVE-2026-0770Langflow exec_globals Inclusion of Functionality from Untrusted Control Sphere Remote Code Execution VulnerabilityKEV
88Now
CVE-2026-9198Unauthenticated Remote Code Execution via Auto-Login Bypass and Code ValidationKEV
78This week

Published before and after this one in the same product

← EarlierCVE-2024-42835Oct 31, 2024 · langflow v1.0.12 was discovered to contain a remote code execution (RCE) vulnerability via the PythonCodeTool component.
39Monitor
← EarlierCVE-2024-48061Nov 4, 2024 · langflow <=1.0.18 is vulnerable to Remote Code Execution (RCE) as any component provided the code functionality and the components run on th
39Monitor
Later →CVE-2025-57760Aug 25, 2025 · Langflow Vulnerable to Privilege Escalation via CLI Superuser Creation
35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
langflow-ai langflow	1.3.0	Vendor (CNA)
PyPI:langflow	1.3.0	Package registry (OSV)
PyPI:langflow-base	0.3.0	Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Metasploit module ×1
Exploit-DB entry ×2
Nuclei detection template ×1
Proof-of-concept repository on GitHub ×28

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Exploit-DB entry	remote	2025-04-18
Exploit-DB entry	webapps	2025-07-16
Metasploit module	exploit/multi/http/langflow_unauth_rce_cve_2025_3248Langflow AI RCEexploit	2025-04-09
Nuclei detection template	Nuclei template CVE-2025-3248	—
Proof-of-concept repository on GitHub	stars:11	2025-04-10
Proof-of-concept repository on GitHub	stars:3	2025-04-10
Proof-of-concept repository on GitHub	stars:10	2025-04-16
Proof-of-concept repository on GitHub	stars:1	2025-05-05
Proof-of-concept repository on GitHub	stars:2	2025-05-13
Proof-of-concept repository on GitHub	stars:1	2025-05-27
Proof-of-concept repository on GitHub	stars:1	2025-05-31
Proof-of-concept repository on GitHub	stars:18	2025-06-17

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedApr 7, 2025
MetasploitApr 9, 2025+1 d
First PoCApr 10, 2025+2 d
CISA KEVMay 5, 2025+27 d
TodayOct 23, 2026+564 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

langflow-ai/langflowPR 6911

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Naveen SunkavallyHorizon3.aifinder

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-21445270 days apartLangflow Missing Authentication on Critical API Endpoints
45Plan
CVE-2026-9103466 days apartUnauthenticated Superuser Token Issuance via Auto-Login Endpoint
40Plan
CVE-2026-9202466 days apartUnauthenticated User Registration Could Lead to Remote Code Execution
39Monitor
CVE-2026-8505466 days apartAuthentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution
39Monitor
CVE-2026-8446485 days apartLangflow is affected by security vulnerabilities in Model Context Protocol features
30Monitor
CVE-2026-19875499 days apartUnauthenticated Registration POST Endpoint Permits Admin Email Overwrite and Outbound Relay Abuse in Langflow
30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

CVE-2025-57760140 days apartLangflow Vulnerable to Privilege Escalation via CLI Superuser Creation
35Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1// Added for the support team
2app.post("/maintenance/reset", resetDevice);

Fixed

1if (config.maintenanceEnabled) {
2  app.post(
3    "/maintenance/reset",
4    requireSession, requireRole("admin"), resetDevice
5  );
6}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:08 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/langflow-ai/langflow/pull/6911

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

What does it mean in your environment?

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Data sources and verification

CNA: VulnCheck

CVE.org (CNA)Oct 8, 2026, 3:21 PM UTC
CISA ADPOct 8, 2026, 3:21 PM UTC
NVDOct 8, 2026, 4:16 PM UTC
FIRST EPSSOct 14, 2026, 12:00 AM UTC
OSV / GHSAOct 23, 2026, 3:18 AM UTC
Exploit-DBOct 23, 2026, 3:18 AM UTC
MetasploitOct 23, 2026, 3:18 AM UTC
NucleiOct 23, 2026, 3:18 AM UTC
PoC-in-GitHubOct 23, 2026, 3:18 AM UTC

Each line is when that source was last processed for this record.