Resource exhaustion in Obsidianforensics Unfurl
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (54.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
- Obsidianforensics Unfurl — versions 0
- Ryandfir Unfurl
Weakness classification (CWE)
References
- GHSA Advisory GHSA-h5qv-qjv4-pc5m (vendor-advisory, Exploit, Vendor Advisory)
- VulnCheck Advisory: dfir-unfurl - Denial of Service via Unbounded zlib Decompression (release-notes, patch, Release Notes)
- www.vulncheck.com/advisories/dfir-unfurl-denial-of-service-via-unbounded-zlib-d… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-40036?
- CVE-2026-40036 is a high-severity vulnerability in Obsidianforensics Unfurl, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 7.5/10. Published 2026-04-08.
- How severe is CVE-2026-40036?
- High severity. CVSS v3 base score is 7.5 out of 10.