RCE in IBM Langflow Oss

CVE-2026-19295

IBM Langflow OSS 1.0.0 through 1.11.1 allows an authenticated attacker to execute arbitrary operating system commands in the server process by saving a flow with a crafted type field value and triggering a build of a wrapper flow that references it. This allowed privilege escalation from "authenticated flow user" to arbitrary OS-level command execution under the server process identity, bypassing the LANGFLOW_ALLOW_CUSTOM_COMPONENTS=false policy control.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.030 (87.0th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-19295: rose from 0.018 to 0.030.

EPSS over last 30 days · oldest: 0.018 · newest: 0.030 · change: +0.012

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-19295?
CVE-2026-19295 is a critical-severity vulnerability in IBM Langflow Oss, classified under Eval Injection. CVSS score: 9.9/10. Published 2026-08-28.
How severe is CVE-2026-19295?
Critical severity. CVSS v3 base score is 9.9 out of 10.
Is CVE-2026-19295 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.