CVE-2026-40036
Published:April 08, 2026
Updated:April 20, 2026
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.
Affected Packages
https://github.com/obsidianforensics/unfurl.git (GITHUB):
Affected version(s) >=v2021.03.11 <v2026.04Fix Suggestion:
Update to version v2026.04dfir-unfurl (PYTHON):
Affected version(s) >=20200629 <20260504Fix Suggestion:
Update to version 20260504dfir-unfurl (PYTHON):
Affected version(s) >=20200629 <20260405Fix Suggestion:
Update to version 20260405Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.14
