# CVE-2026-104317: IBM Langflow OSS unsafe deserialization in message broker

Source: https://junglewise.ai/threats/cve-2026-104317-ibm-langflow-oss-1-0-0-through-1-12-3-could-allow-a-remote  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-29. Updated: 2026-10-29  
License: CC BY 4.0 with a link back

CVE-2026-104317 · Severity: high · CVSS 8.1 · Published 2026-10-29

IBM Langflow OSS is a low-code platform for building AI workflows and applications. An attacker who can reach the message broker component could craft malicious serialized data to execute arbitrary code on the system. This could allow full system compromise, data theft, or service disruption depending on the application's privileges.

Technologies: [IBM Langflow OSS](https://junglewise.ai/threats/technologies/langflow-oss). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-104317 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104317 being exploited in the wild.

**How severe is CVE-2026-104317?** High severity, with a CVSS score of 8.1, 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-2026-104317?** 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-2026-104317 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-104317?** 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 is a deserialization of untrusted data flaw (CWE-502) in the message broker component. An unauthenticated remote attacker with network access to the message broker can exploit this to achieve remote code execution. The advisory does not indicate a fix is currently available.

## Affected products

- IBM Langflow OSS 1.0.0 through 1.12.3

## Timeline

- 2026-10-29: disclosed

## References

- [https://www.ibm.com/support/pages/node/7293015](https://www.ibm.com/support/pages/node/7293015)

## Related threats

- [IBM Langflow OSS path traversal arbitrary file read and write](https://junglewise.ai/threats/cve-2026-97677-ibm-langflow-oss-1-0-0-through-1-12-2-an-authenticated-flow)
- [IBM Langflow OSS authentication bypass](https://junglewise.ai/threats/cve-2026-93680-ibm-langflow-oss-1-0-0-through-1-12-8-could-allow-a-remote)
- [IBM Langflow OSS denial of service via resource exhaustion](https://junglewise.ai/threats/cve-2026-90991-ibm-langflow-oss-1-0-0-through-1-12-4-could-allow-a-remote)
- [IBM Langflow OSS path traversal arbitrary file overwrite](https://junglewise.ai/threats/cve-2026-77819-ibm-langflow-oss-1-0-0-through-1-12-3-could-allow-a-remote)
- [IBM Langflow OSS improper sanitization of secrets in exports](https://junglewise.ai/threats/cve-2026-77817-ibm-langflow-oss-1-0-0-through-1-12-4-could-allow-a-remote)