Quick answers
- Is CVE-2026-90991 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-90991 being exploited in the wild.
- How severe is CVE-2026-90991?
- 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-2026-90991?
- 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-2026-90991 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-90991?
- 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 Langflow OSS versions 1.0.0 through 1.12.4 due to allocation of resources without limits or throttling (CWE-770). An authenticated attacker can send requests that cause the application to allocate excessive resources, exhausting server capacity. The attack requires network access and valid authentication credentials; no user interaction is needed.
Affected products
- IBM Langflow OSS 1.0.0 through 1.12.4
Timeline
- 2026-10-29: disclosed