Disclosure summary
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.
Source-reported weakness categories
CWE-409, CWE-770
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-40036
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| ryandfir | unfurl | * {"versionEndExcluding":"2026.04"} |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Release Notes
- github.com — Exploit, Vendor Advisory
- www.vulncheck.com — Third Party Advisory
PUBLISHED 2026-04-08T18:16:24-04:00
MODIFIED 2026-10-08T12:17:14-04:00
INGESTED 2026-10-10T20:50:35-04:00