High
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.
Announced Group revision 1
Original source ↗CVE-2026-40036
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-40036
unfurl
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/obsidianforensics/unfurl",
"vendor": "obsidianforensics",
"product": "unfurl",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2026.04",
"versionType": "custom"
}
],
"packageURL": "pkg:pypi/dfir-unfurl",
"packageName": "dfir-unfurl",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-40036
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #12717 · Revision 1
- Added to Heist Feed
- Publisher date