CVE-2026-33017Langflow has Unauthenticated Remote Code Execution via Public Flow Build Endpoint
- 9.3CriticalCVSS base score
- 96.4%Exploitation in 30 daysEPSS · top 0.1% of all CVEs
- YesKnown exploitedin CISA's KEV since 25 Mar 2026
- 3Public exploitsMetasploit, Nuclei and Exploit-DB
Description
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.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Langflow Code Injection Vulnerability.
- Added
- 25 Mar 2026
- Fix due (US federal)
- 8 Apr 2026
- Used by ransomware
- Not known
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 25 Mar 2026.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Metasploit module, a Nuclei template and an Exploit-DB entry for it. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: it is being exploited.
Show the exploits4
Metasploit modules1 module
- Langflow Unauth RCE (Metasploit module) (opens in a new tab)
exploit/multi/http/langflow_unauth_rce_cve_2026_33017Rank excellentdisclosed 20 Mar 2026
Nuclei templates1 template
- Langflow < 1.9.0 - Remote Code Execution (Nuclei template) (opens in a new tab)
http/cves/2026/CVE-2026-33017.yamlSeverity critical
Exploit-DB1 entry
- Langflow 1.9.0 - RCE (Exploit-DB entry) (opens in a new tab)
EDB-ID 52627webapps, multiplepublished 8 Jul 2026Not verified
References tagged exploit1 reference
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By GitHub_M
- 3 days later
· 3 days later
Published
- 5 days later
· 5 days later
Added to CISA KEV
Known exploited in the wild
- 57 days later
· 57 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | Critical9.3 | 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 |
| NVDNVD · Analyzed | 4.0 | Critical9.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 96.4% · top 0.1% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.3.
Affected products
- affected < 1.9.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- PyPIlangflowGHSA-vwmf-pq79-vjvx (opens in a new tab)
References
References7
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx (opens in a new tab)x_refsource_CONFIRM
- https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0 (opens in a new tab)x_refsource_MISC
- https://github.com/advisories/GHSA-rvqx-wpfh-mfx7 (opens in a new tab)x_refsource_MISC
- https://www.sysdig.com/blog/cve-2026-33017-how-attackers-compromised-langflow-ai-pipelines-in-20-hours (opens in a new tab)third-party-advisory
- https://medium.com/@aviral23/cve-2026-33017-how-i-found-an-unauthenticated-rce-in-langflow-by-reading-the-code-they-already-dc96cdce5896 (opens in a new tab)exploit
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33017 (opens in a new tab)government-resource
- https://github.com/langflow-ai/langflow/releases/tag/1.8.2 (opens in a new tab)patch
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-13556 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-vwmf-pq79-vjvx (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-33017)Record last updated .