Actively exploited · Published Apr 7, 2025 · Assigned by VulnCheck
CVE-2025-3248Langflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/code
Critical 9.8 Exploited Ransomware
In plain English
A critical-severity missing authentication in langflow from langflow-ai. Attackers are actively exploiting it in the wild (listed by CISA on May 5, 2025). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 100.0% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.
CISA guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by May 26, 2025.
Official 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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | langflow | 1.3.0 | GHSA-rvqx-wpfh-mfx7 |
| PyPI | langflow | 1.3.0 | PYSEC-2025-36 |
| PyPI | langflow-base | 0.3.0 | GHSA-rvqx-wpfh-mfx7 |
| PyPI | langflow-base | 0.3.0 | PYSEC-2026-380 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| langflow-ai | langflow | 0 – before 1.3.0 |
Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/langflow-ai/langflow/pull/6911 issue-tracking
- https://github.com/langflow-ai/langflow/releases/tag/1.3.0 release-notes
- https://www.horizon3.ai/attack-research/disclosures/unsafe-at-any-speed-abusing-python-exec-for-unauth-rce-in-langflow-ai/ exploit
- https://www.vulncheck.com/advisories/langflow-unauthenticated-rce third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3248 government-resource