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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| obsidianforensics | unfurl | < 2026.04 | 2026.04 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | dfir-unfurl | < 20260405 | 20260405 | GHSA-h5qv-qjv4-pc5m |
References
- GitHub Security Advisory (GHSA-h5qv-qjv4-pc5m) vendor-advisory
- unfurl 2026.04 Release Notes release-notes patch
- https://www.vulncheck.com/advisories/dfir-unfurl-denial-of-service-via-unbounded-zlib-decompression third-party-advisory