Langflow: Unauthenticated Shareable Playground arbitrary local or S3 file read

published 2026-06-16 4 mo ago modified 2026-10-26 13 d ago also GHSA-rcjh-r59h-gq37 , PYSEC-2026-244 , EUVD-2026-38520

cvss: 6.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits: 0; none known

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.10.0, the "Shareable Playground" (or "Public Flows" in code) contains a potential arbitrary file-read vulnerability, depending on the exact flow configuration used. By making a flow public, public execution of the flow is allowed. The execution request can contain a list of files that gets read by Langflow and fed into the LLM. The files path can be any path supported by the storage - it can be either a local file or S3 path if supported by the local configuration This vulnerability is fixed in 1.10.0.

Patch / fix

fixed in 2

pypi langflow 1.10.0
langflow langflow 1.10.0

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 4 mo ago (2026-06-24)

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/langflow-ai/langflow/security/advisories/GHSA-rcjh-r59h-gq37 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
OSV	3.1	6.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
GitHub	3.1	6.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	langflow	<1.10.0	1.10.0

Affected products

langflow-ai langflow

Classification

Weakness

CWE-73 External Control of File Name or Path

References

github.com /langflow-ai/langflow/security/advisories/GHSA-rcjh-r59h-gq37
exploit, web, vendor-advisory, evidence
nvd.nist.gov /vuln/detail/CVE-2026-48520
advisory
github.com /langflow-ai/langflow
package
github.com /pypa/advisory-database/tree/main/vulns/langflow/PYSEC-2026-244.yaml
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary