CVE-2026-33017

CRITICALNVD 9.89.8
EchelonGraph scoreHIGH confidence

“—” beside the score: it is equal to NVD's CVSS score.

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 Known Exploited Vulnerabilities catalog, EPSS, GitHub Security Advisory, NVD CVSS v3
Exploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV) — the reason this is sooner than the SSVC decision on this page at low mission impact
CISA-KEV: ExploitedEPSS PROB: 25%CVSS: 9.8Exploit: Metasploit · other public PoCExposed services: Not assessed

A fix is available — apply it.

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
9.8CRITICALhigh confidence
EG Risk
99
EG Risk 99/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation100% × 40%
Fixed at 100% for a CISA KEV listing: EchelonGraph's rule.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Attend at low mission impact; Act at medium or high.
Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.
EPSS PROB
25%
EPSS %ILE
97th
KEV
⚠ Exploited

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
25% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-21). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
CISA KEV and EG-KEV Tier 1 (exploited in the wild)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Act at medium mission impactAttend at low mission impact; Act at medium or high.CISA BOD 26-04: 3 days & forensic triage if the affected system is publicly exposed; 3 days & forensic triage if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Attend at low mission impact; Act at medium or high.

A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days & forensic triage if the affected system is publicly exposed; 3 days & forensic triage if it is not.

In CISA KEV yes (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

CISA required action“Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”

Quoted verbatim from CISA's Known Exploited Vulnerabilities catalog. CISA directs it at US federal civilian executive branch agencies under Binding Operational Directive (BOD) 26-04, which replaced BOD 22-01 on 10 June 2026; it is not EchelonGraph's advice. CISA's notes: https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx · https://nvd.nist.gov/vuln/detail/CVE-2026-33017

Published

March 20, 2026

Last Modified

June 17, 2026

Advisory Details (6)

Auto-updated Oct 19, 2026
⚠️ Actively exploited (CISA KEV, CISA Vulnrichment). Patch available. Sources: github, github_commit, cisa.
Web page

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🔴 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 advisoryMentions a patch (unverified)🟡 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 advisoryMentions a patch (unverified)

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

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

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
langflow0.0.31 ... 1.8.4 (293 versions)
  • every version up to 1.9.0: fixed in 1.9.0
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 60× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 96 of 257 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 161 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-21 18:56 UTCEG score recompute
  2. 2026-10-21 16:32 UTCEPSS rescoreEPSS 25% · 97th percentile
  3. 2026-10-20 20:56 UTCEG score recompute
  4. 2026-10-20 16:33 UTCEPSS rescoreEPSS 25% · 97th percentile
  5. 2026-10-19 22:56 UTCEG score recompute
  6. 2026-10-19 16:31 UTCEPSS rescoreEPSS 25% · 97th percentile
  7. 2026-10-19 00:55 UTCEG score recompute
  8. 2026-10-18 03:47 UTCEG score recompute
  9. 2026-10-18 02:55 UTCEG score recompute
  10. 2026-10-17 16:34 UTCEPSS rescoreEPSS 25% · 97th percentile
  11. 2026-10-17 04:54 UTCEG score recompute
  12. 2026-10-16 16:41 UTCEPSS rescoreEPSS 25% · 97th percentile
  13. 2026-10-16 06:55 UTCEG score recompute
  14. 2026-10-15 16:32 UTCEPSS rescoreEPSS 25% · 97th percentile
  15. 2026-10-15 08:55 UTCEG score recompute
  16. 2026-10-14 16:32 UTCEPSS rescoreEPSS 25% · 97th percentile
  17. 2026-10-14 10:55 UTCEG score recompute
  18. 2026-10-13 16:34 UTCEPSS rescoreEPSS 25% · 97th percentile
  19. 2026-10-13 12:52 UTCEG score recompute
  20. 2026-10-12 14:50 UTCEG score recompute
  21. 2026-10-11 19:56 UTCEG score recompute
  22. 2026-10-11 17:09 UTCEG score recompute
  23. 2026-10-11 14:17 UTCEG score recompute
  24. 2026-10-11 13:48 UTCEPSS rescoreEPSS 25% · 97th percentile
  25. 2026-10-10 23:34 UTCEG score recompute
Show 71 more
  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 25% · 97th percentile
  2. 2026-10-09 21:48 UTCEG score recompute
  3. 2026-10-09 20:07 UTCEPSS rescoreEPSS 25% · 97th percentile
  4. 2026-10-08 20:01 UTCEG score recompute
  5. 2026-10-08 17:12 UTCEPSS rescoreEPSS 25% · 97th percentile
  6. 2026-10-08 01:35 UTCEG score recompute
  7. 2026-10-07 23:47 UTCEPSS rescoreEPSS 25% · 97th percentile
  8. 2026-10-06 16:32 UTCEG score recompute
  9. 2026-10-06 15:17 UTCEPSS rescoreEPSS 25% · 97th percentile
  10. 2026-10-05 18:30 UTCEG score recompute
  11. 2026-10-05 17:42 UTCEPSS rescoreEPSS 25% · 97th percentile
  12. 2026-10-03 15:02 UTCEG score recompute
  13. 2026-10-03 14:25 UTCEPSS rescoreEPSS 25% · 97th percentile
  14. 2026-10-02 16:55 UTCEG score recompute
  15. 2026-10-01 22:31 UTCEG score recompute
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 25% · 97th percentile
  17. 2026-09-30 17:07 UTCEG score recompute
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 25% · 97th percentile
  19. 2026-09-29 15:21 UTCEG score recompute
  20. 2026-09-29 00:39 UTCEG score recompute
  21. 2026-09-28 17:18 UTCEG score recompute
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 25% · 97th percentile
  23. 2026-09-27 21:51 UTCCISA KEV update
  24. 2026-09-27 15:37 UTCEG score recompute
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 25% · 97th percentile
  26. 2026-09-26 17:34 UTCEG score recompute
  27. 2026-09-26 15:58 UTCEPSS rescoreEPSS 25% · 97th percentile
  28. 2026-09-26 02:51 UTCEG score recompute
  29. 2026-09-26 00:26 UTCEPSS rescoreEPSS 25% · 97th percentile
  30. 2026-09-25 19:35 UTCCISA KEV update
  31. 2026-09-25 14:55 UTCCISA KEV update
  32. 2026-09-24 19:31 UTCCISA KEV update
  33. 2026-09-24 14:09 UTCEG score recompute
  34. 2026-09-22 19:36 UTCCISA KEV update
  35. 2026-09-22 18:08 UTCEG score recompute
  36. 2026-09-21 23:45 UTCEG score recompute
  37. 2026-09-21 19:09 UTCCISA KEV update
  38. 2026-09-18 22:16 UTCEG score recompute
  39. 2026-09-18 19:28 UTCEPSS rescoreEPSS 96% · 99th percentile
  40. 2026-09-18 19:20 UTCCISA KEV update
  41. 2026-09-18 14:15 UTCCISA KEV update
  42. 2026-09-16 14:10 UTCCISA KEV update
  43. 2026-09-14 19:24 UTCCISA KEV update
  44. 2026-09-11 18:49 UTCCISA KEV update
  45. 2026-09-11 17:07 UTCEG score recompute
  46. 2026-09-11 14:52 UTCEPSS rescoreEPSS 96% · 99th percentile
  47. 2026-09-10 19:28 UTCCISA KEV update
  48. 2026-09-09 19:08 UTCCISA KEV update
  49. 2026-09-08 18:54 UTCCISA KEV update
  50. 2026-09-06 15:41 UTCEG score recompute
  51. 2026-09-06 13:47 UTCEPSS rescoreEPSS 96% · 99th percentile
  52. 2026-09-05 17:39 UTCEG score recompute
  53. 2026-09-04 17:38 UTCCISA KEV update
  54. 2026-09-02 17:33 UTCCISA KEV update
  55. 2026-09-01 06:45 UTCEG score recompute
  56. 2026-09-01 04:39 UTCEPSS rescoreEPSS 96% · 99th percentile
  57. 2026-08-31 14:19 UTCCISA KEV update
  58. 2026-08-30 21:35 UTCEG score recompute
  59. 2026-08-30 19:17 UTCEPSS rescoreEPSS 96% · 99th percentile
  60. 2026-08-28 21:44 UTCEG score recompute
  61. 2026-08-28 21:41 UTCEPSS rescoreEPSS 96% · 99th percentile
  62. 2026-08-27 17:22 UTCCISA KEV update
  63. 2026-08-26 17:41 UTCCISA KEV update
  64. 2026-08-24 18:52 UTCCISA KEV update
  65. 2026-08-24 14:54 UTCEG score recompute
  66. 2026-08-24 14:17 UTCEPSS rescoreEPSS 96% · 99th percentile
  67. 2026-08-24 11:14 UTCEG score recompute
  68. 2026-08-21 16:49 UTCCISA KEV update
  69. 2026-08-21 02:31 UTCEG score recompute
  70. 2026-08-20 22:55 UTCEPSS rescoreEPSS 96% · 99th percentile
  71. 2026-08-20 17:06 UTCCISA KEV update

Publicly available exploits

(8 references)

Public exploit code is referenced for this CVE (1 Metasploit module, 1 Exploit-DB entry, 5 GitHub PoCs), as is 1 Nuclei detection template. A detection template checks whether a system is affected; it is not necessarily exploit code. Defenders should treat patch urgency accordingly.

  • Metasploitexploit/multi/http/langflow_unauth_rce_cve_2026_33017✓ verified
    Published Aug 11, 2026

    Langflow Unauth RCE

    Open source ↗
  • GitHub PoCCerberusMrXi/Langflow-cve-2026-33017-exploit
    Published 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
    Published Jul 8, 2026

    Langflow 1.9.0 - RCE

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

    Python POC, Exploit for CVE-2026-33017

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-33017.yaml
    Published Apr 30, 2026

    Langflow < 1.9.0 - Remote Code Execution

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

    Langflow RCE

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

    CVE-2026-33017: Unauthenticated RCE in Langflow

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

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

    Open source ↗

Frequently asked(6)

What is CVE-2026-33017?
CVE-2026-33017 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-33017 published?
The CVE record for CVE-2026-33017 was published on March 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
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 attention. A fix is available. Apply it.
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 affected packages EchelonGraph has on record, with version ranges, are listed in the Affected Packages section of this page.
How do I remediate CVE-2026-33017?
A fix for CVE-2026-33017 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-33017 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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

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Is Your Infrastructure Affected by CVE-2026-33017?

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