Quick answers
- Is CVE-2026-18894 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-18894 being exploited in the wild.
- How severe is CVE-2026-18894?
- Medium severity, with a CVSS score of 6.5, published 29 October 2026.
- Which products and versions are affected?
- IBM Langflow OSS 1.0.0 through 1.12.4.
- Is there a fix for CVE-2026-18894?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-18894 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-18894?
- Check whether you run IBM Langflow OSS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in how Langflow handles execution of public workflows that contain custom Python components. An unauthenticated remote attacker can invoke a public workflow and trigger execution of arbitrary Python component code that was previously saved by the workflow owner, executing it in the server process under the owner's runtime context. This breaks the intended trust boundary that restricts public execution paths to server-trusted components only.
Affected products
- IBM Langflow OSS 1.0.0 through 1.12.4
Timeline
- 2026-10-29: disclosed