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CVE-2026-40036

8.7 high SSVC exploitation: poc Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.7 · ryandfirNVD modified 2026-10-08 16:17

Affected (CPE criteria) 1

  • cpe:2.3:a:ryandfir:unfurl:*:*:*:*:*:*:*:*

References 3