How severe is CVE-2025-3248?

CVE-2025-3248 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2025-3248?

CVE-2025-3248 affects the following packages: langflow (PyPI), langflow-base (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2025-3248?

Update langflow to version 1.3.0 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is CVE-2025-3248 actively exploited in the wild?

Yes. There are 8 known exploit references for CVE-2025-3248, including 2 documented proof-of-concept exploits on Exploit-DB. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2025-3248?

CVE-2025-3248 has an EPSS (Exploit Prediction Scoring System) score of 93.0%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2025-3248 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2025-3248 (Langflow Missing Authentication Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-05-05. CISA required all US federal civilian agencies to remediate this vulnerability by 2025-05-26. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2025-3248?

CVE-2025-3248 is classified as Missing Authentication (CWE-306), Code Injection (CWE-94). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Is there exploit tooling available for CVE-2025-3248?

A Nuclei detection template exists for CVE-2025-3248, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2025-3248 published, and has it been updated?

CVE-2025-3248 was published on April 7, 2025 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2025-05-05 — agencies required to remediate by 2025-05-26

🐍 PyPI

CVE-2025-3248

CRITICAL

Langflow Unauth RCE

Also known asGHSA-rvqx-wpfh-mfx7PYSEC-2025-36

Published

Apr 7, 2025

Updated

Apr 10, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

8 known

EPSS Exploitation Probability

via FIRST.org ↗

93.0%probability of exploitation in next 30 days

Very High Risk100th percentile+0.32%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

2 pkgs affected

🐍langflow🐍langflow-base

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`langflow`	all versions	1.3.0
🐍PyPI	`langflow-base`	all versions	0.3.0

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-52364webappsmultiple

Langflow 1.2.x - Remote Code Execution (RCE)

by Raghad Abdallah Al-syouf · Jul 16, 2025

Exploit-DB Source

EDB-52262remotemultiple

Langflow 1.3.0 - Remote Code Execution (RCE)

by VeryLazyTech · Apr 18, 2025

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2025-3248 in your stack?

O3 detects CVE-2025-3248 across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works