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CVE-2026-12944

CriticalPublished

Incomplete Security Scanner Blocklist Enables Network-Based Code Execution

Published: Sep 14, 2026
Updated: Sep 16, 2026
Assigning CNA: ibm
Evidence observed: Sep 15, 2026

Primary CVSS

9.6/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 16.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

IBM Langflow OSS 1.0.0 through 1.10.0 can allow attackers to execute arbitrary Python code with root privileges (UID=0) on the Langflow server by submitting components containing socket or urllib imports. This enables: (1) AWS credential theft via IMDSv1 SSRF with full IAM role permissions, (2) arbitrary file exfiltration from the container filesystem, and (3) lateral movement to internal services (PostgreSQL, Redis) within the Docker network. The scanner incorrectly returns "validated": true, providing a false security signal.

Sources

CVE-2026-12944PoC
Python PoC for CVE-2026-12944, a Langflow 1.10.0 urllib SSRF and file-read vulnerability. Fingerprints versions and exploits the custom_component endpoint.
CVE-2026-12944PoC
Python PoC exploiting CVE-2026-12944, an SSRF in Langflow 1.10.0 via urllib in custom components, with authenticated read and fetch capabilities.

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