Is CVE-2026-33017 actively exploited?

Yes. KEV Intelligence has observed exploitation attempts targeting this CVE. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence sensors have observed 29 exploitation attempts, 11 unique attacker IPs, and 7 countries targeting CVE-2026-33017. First observed Jul 12, 2026; last observed Aug 18, 2026.

Which versions are affected?

CVE-2026-33017 affects langflow-ai langflow. Reported affected version: < 1.9.0.

How should organizations remediate it?

Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.

Yes. CVE-2026-33017 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 1 day ahead of CISA.

CVE-2026-33017 Exploitation Observed — langflow

Q: How should organizations remediate it?

Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.

Q: Is it in CISA KEV?

Yes. CVE-2026-33017 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 1 day ahead of CISA.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-33017 is an unauthenticated vulnerability affecting langflow-ai langflow. Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST...

Is it exploited?

Yes. KEV Intelligence sensors observed exploitation attempts with confirmed confidence.

Who is affected?

langflow-ai / langflow affected before 1.9.0.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Langflow is a tool for building and deploying AI-powered agents and workflows

Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST /api/v1/build_public_tmp/{flow_id}/flow endpoint allows building public flows without requiring authentication. When the optional data parameter is supplied, the endpoint uses attacker-controlled flow data (containing arbitrary Python code in node definitions) instead of the stored flow data from the database. This code is passed to exec() with zero sandboxing, resulting in unauthenticated remote code execution.

This is distinct from CVE-2025-3248, which fixed /api/v1/validate/code by adding authentication. The build_public_tmp endpoint is designed to be unauthenticated (for public flows) but incorrectly accepts attacker-supplied flow data containing arbitrary executable code. This issue has been fixed in version 1.9.0.

Vendor Product Affected Status

langflow-ai langflow Before 1.9.0 Affected

Published: 20 Mar 2026
Exploitation Reported: 01 Jun 2026
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-33017
https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx github.com · CVE Record https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf...
https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0 github.com · CVE Record https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752...
https://github.com/advisories/GHSA-rvqx-wpfh-mfx7 github.com · CVE Record https://github.com/advisories/GHSA-rvqx-wpfh-mfx7

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Active exploitation observed

KEV Intelligence sensor

First observed 14 Jul 2026

First-party sensor telemetry confirms matching exploitation attempts.

Proof of concept available

GitHub

Recorded 31 Mar 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
CVE First	2026-06-01 12:26 UTC
CISA	2026-06-02 14:02 UTC
KEV Intelligence	2026-07-14 17:21 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Aggregate observations show the scale, recency, and distribution of activity without overstating sparse data.

29

Attempts observed

11

Unique attacker IPs

7

Attacker countries

CN · GB · ID · JP · KE · NL · US

1

Sensors observed

Exploitation attempts over the last 40 days

Daily events observed by KEV Intelligence sensors

Updated 19 Aug 2026

0

1

9

2

0

4

0

6

0

1

4

0

1

7

2

0

1

0

1

0

10

0

11 Jul 19 Jul 27 Jul 4 Aug 19 Aug

First observed 12 Jul 2026 · Last observed 18 Aug 2026

Pro adds sensor region and window summaries. Enterprise adds raw IPs, paths, User-Agents, and payloads.

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 23
User-Agents: 10

Raw values available in Pro and Enterprise.

Scanner coverage

Nuclei template detected 01 Jun 2026.

View Nuclei template

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

Learn about Pro API access

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-33017.yaml	01 Jun 2026

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

9.3 Critical

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

EPSS

96.2%

Weaknesses

Missing Authentication for Critical Function CWE-306 Improper Control of Generation of Code ('Code Injection') CWE-94 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection') CWE-95

Recent mention · Tenable Blog

The Agentic AI threat cluster: Seven incidents, three actors, and what they mean for your exposure

Tenable’s Research Special Operations (RSO) team has been tracking a cluster of agentic AI threat activity since late July 2026. The Taiwan autonomous AI cyber attack confirmed what the cluster data already showed: near-autonomous offensive AI has crossed from theoretical risk...

Read full advisory

All CVSS Scores

CVSS v4.0 9.3 Critical

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

CVSS v3.1 9.8 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

All Mentions

Recent mention · Tenable Blog

The Agentic AI threat cluster: Seven incidents, three actors, and what they mean for your exposure

Tenable Blog · 15 Aug 2026

Tenable’s Research Special Operations (RSO) team has been tracking a cluster of agentic AI threat activity since late July 2026. The Taiwan autonomous AI cyber attack confirmed what the cluster data already showed: near-autonomous offensive AI has crossed from theoretical risk to operational reality.Key TakeawaysTaiwan's Ministry of Digital Affairs confirmed a near-autonomous AI cyber attack in July 2026 in which autonomous agents mapped 21 connected government systems, compromised 85 accounts, and exfiltrated more than 2,564 personnel records in approximately four days.The Taiwan campaign...

Recent mention · Rapid7

Metasploit Wrap Up: Lot of summer shells and fit http profiles

Rapid7 · 14 Aug 2026

This wrap-up brings a full-on shell parade. Thirteen shiny new modules landed, starting with a buffet of RCEs. WordPress WP2Shell, Ghost CMS, Joomla JCE, Langflow, OpenCATS, Pterodactyl Panel, SonicWall SMA1000, Ray Dashboard, a Pix-for-WooCommerce, and for those who like their exploits closer to the bare-metal, the Fragnesia Linux kernel LPE (CVE-2026-46300). Metasploit also got the glow-up of the summer with the new http malleable profiles, MCP functionality and linux multi fetch payloads (more details on the [official 6.5 release blog...

Recent mention · DarkWebInformer

One POST to RCE: Unauthenticated Code Execution in Langflow (CVE-2026-33017)

DarkWebInformer · 30 Jun 2026

CVE-2026-33017 is a critical unauthenticated remote code execution flaw in Langflow, the popular open-source visual framework for building AI agents and RAG pipelines.

Recent mention · TheHackerNews

Langflow RCE Exploited to Deploy Monero Miner on Exposed AI App Endpoints

TheHackerNews · 30 Jun 2026

Threat actors are continuing to exploit a critical Langflow vulnerability as part of fresh attacks designed to deliver a Monero cryptocurrency miner. The activity has been found to weaponize CVE-2026-33017 (CVSS score: 9.3), an unauthenticated remote code execution (RCE) vulnerability in Langflow, indicating threat actors are scanning and targeting exposed artificial intelligence (AI)

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

l4st98/CVE-2026-33017-FireFlow

github · Created 2026-08-17 16:12:01 UTC · 0 stars · AI assessment 90%

CVE-2026-33017, vuln in langflow.

lxxexxbxx/CVE-2026-33017

github · Created 2026-08-13 14:06:09 UTC · 1 stars · AI assessment 90%

CVE-2026-33017: Langflow Unauthenticated RCE PoC

sonnelon/CVE-2026-33017-PoC

github · Created 2026-08-13 13:33:56 UTC · 0 stars · AI assessment 85%

The poc of CVE-2026-33017

TatoSec/CVE-2026-33017-Langflop

github · Created 2026-08-05 18:56:56 UTC · 0 stars · AI assessment 90%

CVE-2026-33017 Langflow RCE PoC

Langflow < 1.9.0 - Remote Code Execution

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

14 Jul 2026
Observed by KEV Intelligence sensors

Evidence-backed exploitation signal
12 Jul 2026
Indicators of compromise added (23)

Indicators of compromise recorded
12 Jun 2026
Public PoC available

Public proof-of-concept code published
02 Jun 2026
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
01 Jun 2026
Nuclei template available

Scanner coverage available
01 Jun 2026
Added to KEV Intelligence KEV Feed

High-confidence, third-party attested exploitation
20 Mar 2026
CVE published

Vulnerability disclosed publicly
17 Mar 2026
CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-33017

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2026-33017",
  "confidence": "Confirmed",
  "cvss_score": 9.3,
  "cvss_estimated": false,
  "epss_score": 0.96177,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 29, "sensors": 1 }
}

CVE-2026-33017

What security teams need to know first

Langflow is a tool for building and deploying AI-powered agents and workflows

Tags

CVE References

Why KEV Intelligence marks this CVE as exploited

Exploited in the wild

Active exploitation observed

Proof of concept available

Known exploited vulnerability sources

First-party evidence of exploitation activity

Operational artifacts and observed signals

Observed signals

Scanner coverage

Virtual patch status

Attacker IP Indicators

Scanner Artifacts

Severity, weaknesses, and research context

Weaknesses

The Agentic AI threat cluster: Seven incidents, three actors, and what they mean for your exposure

All CVSS Scores

All Mentions

Potential Proof of Concepts

From disclosure to observed exploitation

Observed by KEV Intelligence sensors

Indicators of compromise added (23)

Public PoC available

Added to CISA KEV

Nuclei template available

Added to KEV Intelligence KEV Feed

CVE published

CVE ID reserved

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