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Advisory record · GHSA-vwmf-pq79-vjvx

Unauthenticated Remote Code Execution in Langflow via Public Flow Build Endpoint

CVSS 9.3 CriticalCriticalIn CISA KEVEPSS 0.96 · 99th percentile

Critical, because:

  • In CISA’s KEV catalogue since 25 Mar 2026: it is known to be exploited.
  • CVSS score 9.3: 9.0 or more.
  • CVSS score 9.3 (7.0 or more) and EPSS 0.96 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 29 Jun 2026, 11:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
langflowPyPI<1.9.01.9.0
Identifiers
GHSA-vwmf-pq79-vjvx · CVE-2026-33017 · PYSEC-2026-379
Weakness (CWE)
CWE-94 · CWE-95 · CWE-306
Tags
Published
29 Jun 2026
Updated
13 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Langflow versions before 1.9.0 are affected. The POST /api/v1/build_public_tmp/{flow_id}/flow endpoint accepts attacker-supplied flow data for public flows without authentication, and that data can contain Python code that the server executes. An unauthenticated attacker who knows a public flow's ID could run arbitrary code with the server process's privileges. Upgrade to Langflow 1.9.0 or later.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.3 Critical 4.0 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 CNA (GitHub_M)
  • CISA KEV Listed since 25 Mar 2026: known to be exploited.
  • EPSS 0.96, the 99th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:04 UTC First seen by agentprime
  2. 31 Oct 2026, 15:04 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.