EUVD-2026-20779
GHSA-c3f2-qg8v-25q2
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4Description
dfir-unfurl through 20250810 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.
Analysis
Unbounded zlib decompression in dfir-unfurl versions through 20250810 enables unauthenticated remote attackers to exhaust server memory via crafted compressed payloads submitted to the /json/visjs endpoint. Attackers can submit highly compressed data that expands to gigabytes when decompressed, crashing the service through resource exhaustion. …
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Remediation
Within 24 hours: Disable or restrict network access to the /json/visjs endpoint on all dfir-unfurl instances; document affected systems and their criticality. Within 7 days: Implement input validation and decompression size limits at the application or WAF level; monitor for unusual compressed payload submissions. …
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External POC / Exploit Code
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