CVE-2026-7869 IBM CVE debrief

Who should care

IBM Langflow OSS users and administrators, security teams, and developers responsible for API security should be aware of this vulnerability. They should review and update IBM Langflow OSS to version 1.10.4 or later, implement proper sanitization and containment checks for user-supplied knowledge base names, restrict access to the Knowledge Bases API to authorized users only, and monitor server filesystem for suspicious activity. Additionally, operators, platform administrators, and vulnerability management teams should assess their exposure and plan remediation efforts accordingly.

Technical summary

The vulnerability occurs because user-supplied knowledge base names are used directly to create file paths without proper sanitization or containment checks in the Knowledge Bases API (`POST /api/v1/knowledge_bases`). This allows an authenticated attacker to create directories and write files anywhere on the server's filesystem. The affected product is IBM Langflow OSS 1.0.0 through 1.10.3. The vulnerability has a CVSS score of 5.4 and a severity of MEDIUM.

Defensive priority

Medium-severity Path Traversal vulnerability in IBM Langflow OSS Knowledge Bases API requires immediate attention.

Recommended defensive actions

• Review and update IBM Langflow OSS to version 1.10.4 or later
• Implement proper sanitization and containment checks for user-supplied knowledge base names
• Restrict access to the Knowledge Bases API to authorized users only
• Monitor server filesystem for suspicious activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further investigation is needed to determine the full scope of the vulnerability and potential impact. The vulnerability occurs in IBM Langflow OSS 1.0.0 through 1.10.3, affecting the Knowledge Bases API. User-supplied knowledge base names are used directly to create file paths without proper sanitization or containment checks, allowing an authenticated attacker to create directories and write files anywhere on the server's filesystem. Defenders should verify affected product deployments, review official advisories, and plan vendor-supported updates or mitigations.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.