CVE-2026-33873

CRITICALNVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.9 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 80% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.9Exploit: 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. Prior to version 1.9.0, the Agentic Assistant feature in Langflow executes LLM-generated Python code during its validation phase. Although this phase appears intended to validate generated component code, the implementation reaches dynamic execution sinks and instantiates the generated class server-side. In deployments where an attacker can access the Agentic Assistant feature and influence the model output, this can result in arbitrary server-side Python execution. Version 1.9.0 fixes the issue.

CVSS v3
9.9
EG Score
9.9(medium)
EPSS
70.2%
KEV
Not listed

Published

March 27, 2026

Last Modified

April 3, 2026

Advisory Details (10)

Auto-updated Jul 20, 2026
No patch confirmed yet.
generic

langflow/src/backend/base/langflow/services/auth/utils.py at f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/blob/f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc/src/backend/base/langflow/services/auth/utils.py#L156-L163
generic

langflow/src/backend/base/langflow/api/v1/login.py at f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/blob/f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc/src/backend/base/langflow/api/v1/login.py#L96-L135
generic

langflow/src/backend/base/langflow/api/utils/core.py at f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/blob/f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc/src/backend/base/langflow/api/utils/core.py#L38
generic

langflow/src/backend/base/langflow/agentic/services/assistant_service.py at f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/blob/f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc/src/backend/base/langflow/agentic/services/assistant_service.py#L58-L79
generic

langflow/src/backend/base/langflow/agentic/services/assistant_service.py at f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/blob/f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc/src/backend/base/langflow/agentic/services/assistant_service.py#L259-L300
generic

langflow/src/backend/base/langflow/agentic/services/assistant_service.py at f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/blob/f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc/src/backend/base/langflow/agentic/services/assistant_service.py#L142-L156
generic

langflow/src/backend/base/langflow/agentic/helpers/validation.py at f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/blob/f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc/src/backend/base/langflow/agentic/helpers/validation.py#L27-L47
generic

langflow/src/backend/base/langflow/agentic/helpers/code_extraction.py at f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/blob/f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc/src/backend/base/langflow/agentic/helpers/code_extraction.py#L11-L53
generic

langflow/src/backend/base/langflow/agentic/api/schemas.py at f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/blob/f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc/src/backend/base/langflow/agentic/api/schemas.py#L20-L31
generic

langflow/src/backend/base/langflow/agentic/api/router.py at f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/blob/f7f4d1e70ba5eecd18162ec96f3571c2cfbcd1fc/src/backend/base/langflow/agentic/api/router.py#L252-L297

Vendor Advisories for CVE-2026-33873(1)

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

Affected Packages

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

Data Freshness Timeline

(refreshed 8× in last 7d / 40× 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.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
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  7. 2026-07-17 20:29 UTCOSV refresh
  8. 2026-07-16 17:03 UTCEPSS rescore
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  1. 2026-07-01 15:06 UTCEPSS rescore
  2. 2026-06-30 23:22 UTCEPSS rescore
  3. 2026-06-29 18:23 UTCOSV refresh
  4. 2026-06-29 14:06 UTCEPSS rescore
  5. 2026-06-29 14:06 UTCEPSS rescore
  6. 2026-06-28 14:07 UTCEPSS rescore
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  8. 2026-06-28 04:56 UTCEPSS rescore
  9. 2026-06-28 04:56 UTCEPSS rescore
  10. 2026-06-27 03:08 UTCEPSS rescore
  11. 2026-06-25 13:49 UTCEPSS rescore
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  18. 2026-06-21 14:56 UTCEPSS rescore
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  20. 2026-06-21 01:59 UTCEPSS rescore
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  23. 2026-06-18 17:52 UTCEPSS rescore
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  25. 2026-06-17 17:53 UTCEPSS rescore
  26. 2026-06-16 17:52 UTCEPSS rescore
  27. 2026-06-15 17:49 UTCEPSS rescore
  28. 2026-06-14 23:18 UTCEPSS rescore
  29. 2026-06-13 23:00 UTCEPSS rescore
  30. 2026-06-12 23:12 UTCEPSS rescore
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  35. 2026-06-08 14:17 UTCEPSS rescore
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  37. 2026-06-07 15:25 UTCEPSS rescore
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  40. 2026-06-06 13:47 UTCEPSS rescore
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  44. 2026-06-05 06:10 UTCEPSS rescore
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  46. 2026-06-04 13:12 UTCEPSS rescore
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  48. 2026-06-02 20:13 UTCEPSS rescore
  49. 2026-06-01 13:52 UTCEPSS rescore
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  57. 2026-05-30 21:53 UTCOSV refresh
  58. 2026-05-29 13:44 UTCEPSS rescore
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  71. 2026-05-20 11:22 UTCEPSS rescore
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  73. 2026-05-18 22:45 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-33873?
CVE-2026-33873 is a critical vulnerability published on March 27, 2026. Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.9.0, the Agentic Assistant feature in Langflow executes LLM-generated Python code during its validation phase. Although this phase appears intended to validate generated component code, the…
When was CVE-2026-33873 disclosed?
CVE-2026-33873 was first published in the National Vulnerability Database on March 27, 2026, with the most recent update on April 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33873 actively exploited?
CVE-2026-33873 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-33873?
CVE-2026-33873 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-33873?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33873, 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.

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