What is CVE-2026-40036?

CVE-2026-40036 is a high-severity vulnerability in Obsidianforensics Unfurl, classified under Allocation of Resources Without Limits or Throttling. 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.

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/vi…

EPSS: 0.002 (43.7th percentile) — read the EPSS interpretation.

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.

Affected products

Obsidianforensics Unfurl — versions 0

Weakness classification (CWE)

References

GHSA Advisory GHSA-h5qv-qjv4-pc5m (vendor-advisory)
VulnCheck Advisory: dfir-unfurl - Denial of Service via Unbounded zlib Decompression (release-notes, patch)
www.vulncheck.com/advisories/dfir-unfurl-denial-of-service-via-unbounded-zlib-d… (third-party-advisory)

Frequently asked questions

What is CVE-2026-40036?: CVE-2026-40036 is a high-severity vulnerability in Obsidianforensics Unfurl, classified under Allocation of Resources Without Limits or Throttling. 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.