CVE-2026-18894: IBM Langflow OSS (Critical, CVSS 9.8)
- CVSS
- 9.8 Critical (v3.1)
- EPSS
- 0.4% chance of exploitation in the next 30 days (higher than 36.9% of CVEs)
- Exploited in the wild
- Not on CISA’s KEV list
- Public exploit
- None reported in public exploit databases
- Weakness
- CWE-94
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Published
- Oct 29, 2026
What it is
IBM Langflow OSS 1.0.0 through 1.12.4 could allow a remote attacker to trigger pre-existing stored Python component code in a public workflow, executing it under the flow owner's runtime context within the server process. This bypasses the intended trust boundary where public execution paths are restricted to server-trusted component code.
Description from the National Vulnerability Database.
What to do
Check whether you run IBM Langflow OSS, then apply the vendor’s fix or mitigation from the advisories below.
Advisories and fixes
Sources: NVD, FIRST EPSS, CISA KEV, and public exploit databases (availability only). ThreatRoundup reports whether public exploit code exists but never links to it: fake proof-of-concepts that infect security researchers are common. This page updates automatically.