NVD HIGH: CVE-2026-40036 — Unfurl before 2026.04 contains an unbounded zlib decompression vulnerability in ...

Wednesday, April 8, 2026 at 10:16 PM UTC·Source: NIST NVD

Updated: Monday, April 13, 2026 at 10:17 PM UTC

Executive 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.

Analysis

Indicators of Compromise (1)

CVE (1)

CVE-2026-40036

NVD MITRE CVE

Source Attribution

Originally published by NIST NVD on Apr 8, 2026. Verified by: NIST.

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