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Fencer Vulns
critical 9.8

CVE-2025-3248 kev+ ransomware in the critical feed json

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

published 2025-04-07 19 mo ago modified 2026-11-08 18 h ago also EUVD-2025-10011 , GHSA-rvqx-wpfh-mfx7 , PYSEC-2025-36 , PYSEC-2026-380

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2025-05-05, used in ransomware
epss
100.0%
EPSS 100.0% chance of exploitation in 30 days, percentile 99.9%
public exploits
3
Metasploit, Exploit-DB, plus a Nuclei check

Summary

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.

Patch / fix

cisa required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  • pypi langflow 1.3.0
  • pypi langflow-base 0.3.0
  • langflow-ai langflow 1.3.0

Timeline

  1. Published
  2. First public exploit (Metasploit exploit/multi/http/langflow_unauth_rce_cve_2025_3248)
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
18 mo ago
Patch by
2025-05-26 (17 mo ago)
Ransomware
Known to be used in ransomware campaigns
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor, product
Langflow, Langflow
CISA name
Langflow Missing Authentication Vulnerability

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1203 Exploitation for Client Execution exploitation
  • T1059 Command and Scripting Interpreter primary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
14 mo ago

Exploit prediction

99.99% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
pypi langflow
<1.3.0
1.3.0
pypi langflow-base
<0.3.0
0.3.0

Affected products

  • langflow-ai langflow

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.