What is CVE-2026-81204?

CVE-2026-81204 is a critical-severity vulnerability in IBM Langflow Oss, classified under Code Injection. CVSS score: 9.8/10. Published 2026-09-10.

How severe is CVE-2026-81204?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in IBM Langflow Oss

CVE-2026-81204

IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote attacker to execute arbitrary code due to code injection during graph construction.

Vulnerability class: RCE (Remote Code Execution)

Published 2026-09-10 · last modified 2026-09-16.

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.

EPSS exploit prediction

EPSS: 0.009 (58.2th percentile), scored 2026-10-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-94 — Code Injection

References

www.ibm.com/support/pages/node/7286666 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-81204?: CVE-2026-81204 is a critical-severity vulnerability in IBM Langflow Oss, classified under Code Injection. CVSS score: 9.8/10. Published 2026-09-10.
How severe is CVE-2026-81204?: Critical severity. CVSS v3 base score is 9.8 out of 10.