Auth bypass in Langflow-ai 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
EPSS: 0.927 (99.8th percentile) — read the EPSS interpretation.
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.
Affected products
- Langflow-ai Langflow — versions 0
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . 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: .
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.
Public proof-of-concept exploits
References
- github.com/langflow-ai/langflow/pull/6911 (patch)
- github.com/langflow-ai/langflow/releases/tag/1.3.0 (release-notes)
- www.horizon3.ai/attack-research/disclosures/unsafe-at-any-speed-abusing-python-… (exploit)
- www.vulncheck.com/advisories/langflow-unauthenticated-rce (third-party-advisory)
Frequently asked questions
- What is CVE-2025-3248?
- CVE-2025-3248 is a critical-severity vulnerability in Langflow-ai 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. 83 public proof-of-concept repositories are indexed.