Vulnerability Details CVE-2026-40036
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 32.6%
CVSS Severity
CVSS v3 Score 7.5
References