HIGHCVE-2026-40036Published Modified CNA VulnCheck
CVE-2026-40036: Unfurl < 2026.04 - Denial of Service via Unbounded zlib Decompression
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.
Metrics
- CVSS v4.0
- 8.7
- Severity
- HIGH
- Fixed in
- 2026.04
- Affected Products
- 1
Fix available
2026.04
Affected packages
- obsidianforensics / unfurl< 2026.04 (from 0)
CVSS Vector
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