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    CVE-2026-40036

    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.

    Published:Apr 8, 2026
    Last Modified:Apr 17, 2026
    EPS:Apr 8, 2026
    EPSS Score:0.00131
    CVSS Score:7.5

    Affected Products

    Vendor
    Dfir-unfurl
    Product
    Dfir-unfurl
    Vendor
    Ryandfir
    Product
    Unfurl

    Exploits

    https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-h5qv-qjv4-pc5m

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High