What is CVE-2025-3248?

CVE-2025-3248 is a critical-severity vulnerability in Langflow, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-04-07.

How severe is CVE-2025-3248?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-3248 known to be exploited?

Yes. CVE-2025-3248 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-05-05), indicating it is being actively exploited. 91 public proof-of-concept repositories are indexed.

RCE in Langflow

CVE-2025-3248

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.

Vulnerability class: Broken Authentication

Published 2025-04-07 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 1.000 (100.0th percentile), scored 2026-10-15.

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 100.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 1.000 · newest: 1.000 · change: 0.000

Affected products

Langflow
Langflow-Ai Langflow — versions 0

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2025-05-05. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2025-05-26.

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.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

github.com/langflow-ai/langflow/pull/6911 (issue-tracking, Patch, patch)
github.com/langflow-ai/langflow/releases/tag/1.3.0 (release-notes, Release Notes)
www.horizon3.ai/attack-research/disclosures/unsafe-at-any-speed-abusing-python-… (Exploit, Third Party Advisory, exploit)
www.vulncheck.com/advisories/langflow-unauthenticated-rce (Third Party Advisory, third-party-advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2025-3248?: CVE-2025-3248 is a critical-severity vulnerability in Langflow, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-04-07.
How severe is CVE-2025-3248?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-3248 known to be exploited?: Yes. CVE-2025-3248 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-05-05), indicating it is being actively exploited. 91 public proof-of-concept repositories are indexed.