Vulnerability in IBM Langflow Oss
CVE-2026-9201
IBM Langflow OSS 1.0.0 through 1.10.3 could allow an authenticated attacker to execute arbitrary code due to a cryptographic weakness in the custom component validation mechanism. When the optional hardening mode that restricts execution to trusted component templates is enabled, the application validates component code using a truncated SHA‑256 hash. Because the hash comparison relies on only a portion of the digest, an attacker can craft malicious component code that collides with a trusted template hash and bypasses validation. Successful exploitation allows the attacker to introduce and execute unauthorized Python code within the Langflow process, defeating the intended security control and potentially leading to full compromise of the affected instance.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- IBM Langflow Oss — versions 1.0.0
- Langflow
Weakness classification (CWE)
References
- www.ibm.com/support/pages/node/7282646 (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-9201?
- CVE-2026-9201 is a high-severity vulnerability in IBM Langflow Oss, classified under Inadequate Encryption Strength. CVSS score: 8.8/10. Published 2026-08-05.
- How severe is CVE-2026-9201?
- High severity. CVSS v3 base score is 8.8 out of 10.