Threat Intelligence / CVE / CVE-2026-5027

CVE-2026-5027 — langflow-ai langflow

CVSS v3.1 8.8 (HIGH) · EPSS 4.7% (higher than 91.5% of all scored CVEs) · Priority 10/10 · Published 2026-03-27

As of 2026-03-27, CVE-2026-5027 is a HIGH-severity vulnerability in langflow-ai langflow, CVSS v3.1 8.8, EPSS 4.7% (91.5th percentile). Threadlinqs Intelligence links 3 tracked threat campaigns to CVE-2026-5027, most recently “GTIG: AI-Era Vulnerability Discovery and Exploitation Surge — In-the-Wild Exploitation of BeyondTrust CVE-2026-1731, LiteLLM CVE-2026-42271 and Langflow CVE-2026-5027”.

Last updated: 2026-03-27

What is CVE-2026-5027?

The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

The record classifies CVE-2026-5027 under weakness class CWE-22. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 188 days ago.

Severity and exploitation probability

CVSS v3.1 base score
8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
4.7% probability of exploitation in the next 30 days, higher than 91.5% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-03-27

Is CVE-2026-5027 being exploited?

Weaponised exploit code for CVE-2026-5027 is publicly available. 8 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2026/CVE-2026-5027.yaml).

Affected products and versions

How to fix CVE-2026-5027

Vendor advisory: https://www.tenable.com/security/research/tra-2026-26. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-5027

3 tracked threats in the Threadlinqs corpus reference CVE-2026-5027, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references

Full detection coverage & IOCs for threats exploiting CVE-2026-5027 are available via the Threadlinqs MCP server (Purple tier). View plans →

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