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Vulnerabilities

Vulnerability · CVE-2026-5027

Langflow Langflow Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Published Mar 27, 2026 · catalog updated Aug 18, 2026 · Langflow Langflow

Patch now

CVE-2026-5027 is in the CISA known-exploited catalog. Confirm Langflow Langflow against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High8.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
4.76%
Remediation
Remediation guidance
Affected products
cpe langflow/langflow · vendor Langflow Langflow

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 ('../'). VulnCheck canary evidence. Initial-access exploit intelligence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe langflow/langflowversion unspecified
  • vendor Langflow Langflowversion unspecified

How to fix CVE-2026-5027

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-5027 is in the CISA known-exploited catalog. Confirm Langflow Langflow against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-22: Path Traversal. EPSS 4.76%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 27, 2026 · NIST NVD

    Detected

    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 ('../').

  2. Jun 8, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  3. Aug 18, 2026 · NIST NVD

    Updated

    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 ('../').

Sources

  • CVE.orgVulnerability recordCVE-2026-5027

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-5027

    30-day exploitation probability 4.8%

    first.org
  • NIST NVDVulnerability recordCVE-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 ('../').

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-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 ('../').

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.