Quick answers
- Is CVE-2026-84889 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-84889 being exploited in the wild.
- How severe is CVE-2026-84889?
- High severity, with a CVSS score of 8.8, published 10 September 2026.
- Which products and versions are affected?
- IBM Langflow OSS 1.0.0 through 1.10.3.
- Is there a fix for CVE-2026-84889?
- A patch was published on 2026-09-08: Fix available in version 1.11.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-84889 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-84889?
- Check whether you run IBM Langflow OSS or Langflow 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 path traversal (CWE-22) flaw in two independent file handling mechanisms within Langflow OSS. First, the file upload endpoint fails to sanitize the Content-Disposition filename field in multipart requests, allowing attackers to inject directory traversal sequences and write outside the intended storage boundary. Second, a file-writing workflow component accepts unsanitized user-controlled filenames without path containment enforcement. Both vectors require valid API authentication but no user interaction. A successful exploit allows arbitrary file write operations with the privileges of the server process. The fix is available in version 1.11.0.
Affected products
- IBM Langflow OSS 1.0.0 through 1.10.3
Timeline
- 2026-09-08: disclosed
- 2026-09-08: patched: Fix available in version 1.11.0