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.

INFO

Published Date :

2026-04-08T21:35:28.460Z

Last Modified :

2026-05-08T14:06:56.600Z

Source :

VulnCheck
AFFECTED PRODUCTS

The following products are affected by CVE-2026-40036 vulnerability.

Vendors Products
Dfir-unfurl
  • Dfir-unfurl
Ryandfir
  • Unfurl
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-40036.

URL Resource
https://github.com/obsidianforensics/unfurl/releases/tag/v2026.04 cve-icon cve-icon
https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-h5qv-qjv4-pc5m cve-icon cve-icon
https://www.vulncheck.com/advisories/dfir-unfurl-denial-of-service-via-unbounded-zlib-decompression cve-icon cve-icon
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CVSS Vulnerability Scoring System

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Detailed values of each vector for above chart.
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