# CVE-2026-40036

## Summary

- **CVE ID:** CVE-2026-40036
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-770, CWE-409, CWE-770, CWE-409
- **Published:** Apr 8, 2026
- **Last Modified:** Jul 14, 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.

## Affected Products

- obsidianforensics — unfurl (0)

## References

- [CNA](https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-h5qv-qjv4-pc5m)
- [CNA](https://github.com/obsidianforensics/unfurl/releases/tag/v2026.04)
- [CNA](https://www.vulncheck.com/advisories/dfir-unfurl-denial-of-service-via-unbounded-zlib-decompression)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.51%
- **EPSS Percentile:** 41.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._