# CVE-2025-3248: Langflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/code

Status: published. Published: 2025-04-07. Updated: 2026-11-08.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/langflow-ai/langflow/pull/6911

## Affected products and versions

- langflow-ai / langflow (langflow): ≥ 0; < 1.3.0 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: listed; Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.; due 2025-05-26

- EPSS: 99.99% as of 2026-11-08; percentile 99.99%

- SSVC: exploitation active; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-306

## Exploit evidence

- exploit: https://www.horizon3.ai/attack-research/disclosures/unsafe-at-any-speed-abusing-python-exec-for-unauth-rce-in-langflow-ai/ (CNA: VulnCheck)

## References

- https://github.com/langflow-ai/langflow/pull/6911 (CNA: VulnCheck; issue-tracking, patch)

- https://github.com/langflow-ai/langflow/releases/tag/1.3.0 (CNA: VulnCheck; release-notes)

- https://www.horizon3.ai/attack-research/disclosures/unsafe-at-any-speed-abusing-python-exec-for-unauth-rce-in-langflow-ai/ (CNA: VulnCheck; exploit)

- https://www.vulncheck.com/advisories/langflow-unauthenticated-rce (CNA: VulnCheck; third-party-advisory)

- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3248 (ADP: CISA-ADP; government-resource)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2025-3248; retrieved 2026-11-08; source updated 2026-11-08

- CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog; retrieved 2026-11-02; source updated Not reported

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-3248; retrieved 2026-11-08; source updated Not reported

Revision: 15954936267d5b61525c51ef75819ab6b3f157ab76ff921775dcfa234e768102

Canonical: https://y2.dev/cve/CVE-2025-3248

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