CVE-2026-40036

HighCVSS 7.5/10Last modified Oct 8, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-409 CWE-770

Affected software

No affected versions have been published.

Timeline

Published: Apr 8, 2026
Last modified: Oct 8, 2026
NVD status: Analyzed

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