CVE-2026-33017

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-03-25), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 96%CVSS: 9.8Exploit: cisa kev · ssvc active · Metasploit · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
96%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

March 20, 2026

Last Modified

June 17, 2026

Advisory Details (6)

Auto-updated Sep 14, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github, github_commit, cisa.
generic🔴 Active Exploitation

CVE-2026-33017: How attackers compromised Langflow AI pipelines in 20 hours | Sysdig

https://www.sysdig.com/blog/cve-2026-33017-how-attackers-compromised-langflow-ai-pipelines-in-20-hours
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33017
github Patch Available🟡 PoC Available

Unauthenticated Remote Code Execution in Langflow via Public Flow Build Endpoint · Advisory · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx
github_commit

commit 73b6612e3ef2 (langflow-ai/langflow)

Fix landed in langflow-ai/langflow commit 73b6612e3ef2 — awaiting tagged release

https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0
github Patch Available

Langflow Unauth RCE · CVE-2025-3248 · GitHub Advisory Database · GitHub

https://github.com/advisories/GHSA-rvqx-wpfh-mfx7
generic

Release 1.8.2 · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/releases/tag/1.8.2

Vendor Advisories for CVE-2026-33017(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
piplangflow—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
langflow0.0.31 ... 1.8.4 (293 versions)1.9.0—

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 199 total refreshes for this CVE.

  1. 2026-09-18 22:16 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 19:20 UTCCISA KEV update
  5. 2026-09-18 14:15 UTCCISA KEV update
  6. 2026-09-16 14:10 UTCCISA KEV update
  7. 2026-09-14 19:24 UTCCISA KEV update
  8. 2026-09-11 18:49 UTCCISA KEV update
  9. 2026-09-11 17:07 UTCEG score recompute
  10. 2026-09-11 14:52 UTCEPSS rescore
  11. 2026-09-10 19:28 UTCCISA KEV update
  12. 2026-09-09 19:08 UTCCISA KEV update
  13. 2026-09-08 18:54 UTCCISA KEV update
  14. 2026-09-06 15:41 UTCEG score recompute
  15. 2026-09-06 13:47 UTCEPSS rescore
  16. 2026-09-06 13:47 UTCEPSS rescore
  17. 2026-09-05 17:39 UTCEG score recompute
  18. 2026-09-04 17:38 UTCCISA KEV update
  19. 2026-09-02 17:33 UTCCISA KEV update
  20. 2026-09-01 06:45 UTCEG score recompute
  21. 2026-09-01 04:39 UTCEPSS rescore
  22. 2026-09-01 04:39 UTCEPSS rescore
  23. 2026-08-31 14:19 UTCCISA KEV update
  24. 2026-08-30 21:35 UTCEG score recompute
  25. 2026-08-30 19:17 UTCEPSS rescore
Show 75 more
  1. 2026-08-28 21:44 UTCEG score recompute
  2. 2026-08-28 21:41 UTCEPSS rescore
  3. 2026-08-27 17:22 UTCCISA KEV update
  4. 2026-08-26 17:41 UTCCISA KEV update
  5. 2026-08-24 18:52 UTCCISA KEV update
  6. 2026-08-24 14:54 UTCEG score recompute
  7. 2026-08-24 14:17 UTCEPSS rescore
  8. 2026-08-24 11:14 UTCEG score recompute
  9. 2026-08-21 16:49 UTCCISA KEV update
  10. 2026-08-21 02:31 UTCEG score recompute
  11. 2026-08-20 22:55 UTCEPSS rescore
  12. 2026-08-20 22:55 UTCEPSS rescore
  13. 2026-08-20 17:06 UTCCISA KEV update
  14. 2026-08-19 17:33 UTCCISA KEV update
  15. 2026-08-18 16:58 UTCCISA KEV update
  16. 2026-08-17 13:56 UTCCISA KEV update
  17. 2026-08-16 04:48 UTCEG score recompute
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-12 16:25 UTCEG score recompute
  20. 2026-08-12 13:50 UTCEPSS rescore
  21. 2026-08-11 19:32 UTCCISA KEV update
  22. 2026-08-07 17:09 UTCCISA KEV update
  23. 2026-08-05 17:25 UTCCISA KEV update
  24. 2026-08-04 17:02 UTCCISA KEV update
  25. 2026-08-03 19:22 UTCCISA KEV update
  26. 2026-07-30 20:05 UTCEG score recompute
  27. 2026-07-30 16:28 UTCEPSS rescore
  28. 2026-07-30 12:43 UTCEG score recompute
  29. 2026-07-30 01:40 UTCEG score recompute
  30. 2026-07-30 01:30 UTCEPSS rescore
  31. 2026-07-29 19:27 UTCCISA KEV update
  32. 2026-07-27 19:24 UTCCISA KEV update
  33. 2026-07-27 17:17 UTCCISA KEV update
  34. 2026-07-26 12:42 UTCEG score recompute
  35. 2026-07-26 01:38 UTCEG score recompute
  36. 2026-07-24 14:17 UTCEPSS rescore
  37. 2026-07-24 14:17 UTCEPSS rescore
  38. 2026-07-23 03:09 UTCEG score recompute
  39. 2026-07-22 21:37 UTCEG score recompute
  40. 2026-07-22 19:40 UTCCISA KEV update
  41. 2026-07-21 14:37 UTCCISA KEV update
  42. 2026-07-17 09:17 UTCEG score recompute
  43. 2026-07-16 17:04 UTCCISA KEV update
  44. 2026-07-15 16:57 UTCEPSS rescore
  45. 2026-07-15 16:57 UTCEPSS rescore
  46. 2026-07-15 16:49 UTCCISA KEV update
  47. 2026-07-15 15:04 UTCCISA KEV update
  48. 2026-07-14 18:05 UTCCISA KEV update
  49. 2026-07-13 17:07 UTCCISA KEV update
  50. 2026-07-10 17:52 UTCCISA KEV update
  51. 2026-07-09 19:10 UTCEPSS rescore
  52. 2026-07-07 19:01 UTCCISA KEV update
  53. 2026-07-07 17:16 UTCCISA KEV update
  54. 2026-07-06 16:27 UTCEPSS rescore
  55. 2026-07-06 16:27 UTCEPSS rescore
  56. 2026-07-01 19:16 UTCCISA KEV update
  57. 2026-06-29 19:12 UTCCISA KEV update
  58. 2026-06-28 04:56 UTCEPSS rescore
  59. 2026-06-28 04:56 UTCEPSS rescore
  60. 2026-06-27 03:08 UTCEPSS rescore
  61. 2026-06-25 19:15 UTCCISA KEV update
  62. 2026-06-25 13:49 UTCEPSS rescore
  63. 2026-06-25 13:49 UTCEPSS rescore
  64. 2026-06-24 14:05 UTCEPSS rescore
  65. 2026-06-23 17:44 UTCCISA KEV update
  66. 2026-06-18 16:13 UTCCISA KEV update
  67. 2026-06-16 19:33 UTCCISA KEV update
  68. 2026-06-15 19:33 UTCCISA KEV update
  69. 2026-06-15 17:49 UTCEPSS rescore
  70. 2026-06-14 23:18 UTCEPSS rescore
  71. 2026-06-13 23:00 UTCEPSS rescore
  72. 2026-06-12 23:12 UTCEPSS rescore
  73. 2026-06-12 23:12 UTCEPSS rescore
  74. 2026-06-12 17:35 UTCCISA KEV update
  75. 2026-06-11 19:10 UTCCISA KEV update

Publicly available exploits

(8 references)

Working exploit code is in the public domain (1 Metasploit module) (5 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCCerberusMrXi/Langflow-cve-2026-33017-exploit
    First seen Jul 19, 2026

    CVE-2026-33017 exploitation tool for Langflow <1.9.0. Features reverse shells, command execution, file operations, persistence, and automated testing. Validates critical RCE vulnerability impact. For authorized security assessments only.

    Open source ↗
  • Exploit-DBEDB-52627
    First seen Jul 8, 2026

    Langflow 1.9.0 - RCE

    Open source ↗
  • GitHub PoCc0gnit00/CVE-2026-33017
    First seen Jul 2, 2026

    Python POC, Exploit for CVE-2026-33017

    Open source ↗
  • GitHub PoCEQSTLab/CVE-2026-33017
    First seen Mar 31, 2026

    Langflow RCE

    Open source ↗
  • GitHub PoCz4yd3/PoC-CVE-2026-33017
    First seen Mar 27, 2026

    CVE-2026-33017: Unauthenticated RCE in Langflow

    Open source ↗
  • GitHub PoCMaxMnMl/langflow-CVE-2026-33017-poc
    First seen Mar 21, 2026

    CVE-2026-33017 - An unauthenticated remote code execution in Langflow <= 1.8.1 via Public Flow Build Endpoint

    Open source ↗
  • Metasploitexploit/multi/http/langflow_unauth_rce_cve_2026_33017✓ verified
    First seen Mar 20, 2026

    Langflow Unauth RCE

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-33017.yaml
    First seen Jan 1, 2026

    Langflow < 1.9.0 - Remote Code Execution

    Open source ↗

Frequently asked(6)

What is CVE-2026-33017?
CVE-2026-33017 is a critical vulnerability published on March 20, 2026. Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST /api/v1/buildpublictmp/{flowid}/flow endpoint allows building public flows without requiring authentication. When the optional data parameter is supplied, the endpoint uses…
When was CVE-2026-33017 disclosed?
CVE-2026-33017 was first published in the National Vulnerability Database on March 20, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33017 actively exploited?
Yes. CISA added CVE-2026-33017 to the Known Exploited Vulnerabilities catalog on March 25, 2026, affecting Langflow Langflow. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-33017?
CVE-2026-33017 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2026-33017?
CVE-2026-33017 affects Langflow Langflow. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-33017?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33017, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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