GHSA-cf6m-vc3m-7cgm: langflow (CVE-2026-8505)

Package	Ecosystem	Affected	Fixed in
langflow	PyPI	>=1.7.0, <1.9.1	1.9.1

Machine-written summary

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

Langflow versions 1.7.0 up to but not including 1.9.1 are affected. By default in those versions, webhook endpoints do not require authentication, so an unauthenticated remote attacker who knows a flow's UUID can execute that flow as its owner, which the source says could lead to remote code execution or denial of service. Upgrade to Langflow 1.9.1, which makes webhook authentication required by default; operators who explicitly disabled it must re-enable it.

Written 1 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

Score	Rating	CVSS	Vector	Source
9.8	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CNA (ibm)

CISA KEV Not listed.
EPSS 0.0087, the 59th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:08 UTC First seen by agentprime
31 Oct 2026, 14:08 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.