gcdRadar
archive/Patch now/AIR-2026-1329
closedclosed 4 Sep 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-9138: IBM Langflow OSS arbitrary file write vulnerability

Langflow

An improper input validation vulnerability in IBM Langflow OSS allows authenticated attackers to write arbitrary files to the server. No active exploitation has been confirmed.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
6.5
EPSS
<0.01 · top 61% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
4 Sep 2026
last update
4 Sep 2026
CVE ids
CVE-2026-9138other records

Timeline · 1

  1. 4 Sep 2026CVE-2026-9138: IBM Langflow OSS 1.0.0 through 1.11.2 Langflow could allow an authenticated attacker to write arbitrary files to the server due…

Sources · 1

Advisories and databases

  1. 2026-09-04
    CVE-2026-9138: IBM Langflow OSS 1.0.0 through 1.11.2 Langflow could allow an authenticated attacker to write arbitrary files to the server due…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-9138

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
path-traversal
dates
happened 4 Sep 2026 · first reported 4 Sep 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-9138: IBM Langflow OSS arbitrary file write vulnerability

https://gcdradar.vercel.app/incidents/cve-2026-9138-ibm-langflow-oss-arbitrary-file-write-vulnerab · AIR-2026-1329 · closed 2026-09-04

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-09-04
- AI role: Attack on AI
- Products: Langflow
- CVE ids: CVE-2026-9138
- CVSS: 6.5

## Summary

An improper input validation vulnerability in IBM Langflow OSS allows authenticated attackers to write arbitrary files to the server. No active exploitation has been confirmed.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-09-04: CVE-2026-9138: IBM Langflow OSS 1.0.0 through 1.11.2 Langflow could allow an authenticated attacker to write arbitrary files to the server due… (https://nvd.nist.gov/vuln/detail/CVE-2026-9138)

## Sources

- 2026-09-04 NVD: CVE-2026-9138: IBM Langflow OSS 1.0.0 through 1.11.2 Langflow could allow an authenticated attacker to write arbitrary files to the server due… https://nvd.nist.gov/vuln/detail/CVE-2026-9138

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

Related

  1. closed8.8
    Langflow CVE-2026-51886: Code injection vulnerability in Langflow

    Patch now · Disclosed · since 1 Oct 2026 · updated 5 Oct 2026 · CVE-2026-51886

    AI
  2. closed7.5
    Langflow CVE-2026-51888: Directory traversal flaw in Langflow

    Patch now · Disclosed · since 1 Oct 2026 · CVE-2026-51888

    AI
  3. closed4.1
    Langflow CVE-2026-101861: Langflow Unsafe Eval Code Execution Vulnerability

    Patch now · Disclosed · since 28 Sep 2026 · CVE-2026-101861

    AI
  4. closed4.2
    Langflow CVE-2026-12763: Improper cache key isolation vulnerability in Langflow MCP Tools

    Patch now · Disclosed · since 14 Sep 2026 · CVE-2026-12763

    AI
  5. closed5.4
    Langflow CVE-2026-12766: Server-side request forgery vulnerability in Langflow OSS

    Patch now · Disclosed · since 14 Sep 2026 · CVE-2026-12766

    AI
  6. closed6.5
    Langflow CVE-2026-12767: Server-side request forgery vulnerability in Langflow OSS

    Patch now · Disclosed · since 14 Sep 2026 · CVE-2026-12767

    AI