Staging Environment: Content and features may be unstable or change without notice.
Advisory details: pypa / langflow/PYSEC-2026-243
Advisory ID pypa/langflow/PYSEC-2026-243
Aliases CVE-2026-48519
GHSA-v5ff-9q35-q26f
PYSEC-2026-243
Summary Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, the "Shareable Playground" (or "Public Flows" in code) contains a critical RCE vulnerability. Shareable Playground feature works by enabling the execution of workflows by unauthenticated users, by accessing a link. Specifically, it enables the route /api/v1/build_public_tmp to execute any public flow, given a public flow ID. When the route executes the flow, it allows for providing arbitrary custom Python code as the nodes code, inside the JSON payload. The vulnerable field is data.nodes[X].data.node.template.code.value. This vulnerability is fixed in 1.9.2.
Status Published
Exploitability 0.5
Weighted Severity 8.6
Risk 4.3
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3.1 9.6 https://github.com/pypa/advisory-database/blob/main/vulns/langflow/PYSEC-2026-243.yaml
Reference id Reference type URL
https://github.com/langflow-ai/langflow/security/advisories/GHSA-v5ff-9q35-q26f
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Found at https://github.com/pypa/advisory-database/blob/main/vulns/langflow/PYSEC-2026-243.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-06-23T17:02:06Z/

Decision: Track*

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/48xxx/CVE-2026-48519.json

Source Advisory: vulnrichment/CVE-2026-48519

View SSVC decision tree 
[{'Exploitation': 'poc'},
 {'Automatable': 'no'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]