CVE-2026-40036
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Apr 08, 2026
Vendor
unknown
Description
Unfurl before 2026.04 contains an unbounded zlib decompression vulnerability in parse_compressed.py that allows remote attackers to cause denial of service. Attackers can submit highly compressed payloads via URL parameters to the /json/visjs endpoint that expand to gigabytes, exhausting server memory and crashing the service.