Quick answers
- Is CVE-2026-104339 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-104339 being exploited in the wild.
- How severe is CVE-2026-104339?
- Critical severity, with a CVSS score of 9.8, published 29 October 2026.
- Which products and versions are affected?
- IBM Langflow OSS 1.0.0 through 1.12.3.
- Is there a fix for CVE-2026-104339?
- 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-2026-104339 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-104339?
- 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
CVE-2026-104339 is a code injection vulnerability (CWE-94) in Langflow OSS versions 1.0.0 through 1.12.3 resulting from improper neutralization of special elements used in OS command construction. The vulnerability requires no authentication and can be exploited over the network with no user interaction, allowing arbitrary code execution with the privileges of the application process. A fix version is not specified in the advisory, though IBM Security Bulletin mentions the affected range.
Affected products
- IBM Langflow OSS 1.0.0 through 1.12.3
Timeline
- 2026-10-29: disclosed