PT-2026-31471

CVE-2026-40036

Published

2026-01-29

Updated

2026-10-08

Description by

CVSS 4.0

8.7

High

MetricsAV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Unfurl versions prior to 2026.04

Description Unfurl contains a flaw in the parse compressed.py component due to unbounded zlib decompression. Remote attackers can leverage this to cause a denial of service. Specifically, attackers can send large, compressed payloads through URL parameters to the /json/visjs API endpoint. These payloads expand to gigabytes, consuming server memory and leading to service crashes.

Recommendations Update to version 2026.04 or later.

Exploitability

Exploit

Fix

Impacts

Researchers

Mobasi-Team

Vendors

Affected products

Weakness enumeration

CWE-400: Uncontrolled Resource Consumption

CWE-770: Allocation of Resources Without Limits or Throttling