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
Exploited in the wild
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 98%CVSS: 9.8Exploit: NoneExposed: 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)
EPSS
99.9%
KEV
⚠ Exploited

Published

March 20, 2026

Last Modified

May 22, 2026

Advisory Details (6)

Auto-updated Jun 20, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa, github, github_commit.
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 5× in last 7d / 27× 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 136 total refreshes for this CVE.

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

Publicly available exploits

(4 references)

Working exploit code is in the public domain (2 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • 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 ↗
  • 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 May 22, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-33017

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