CVE-2026-40036

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Source
https://cve.org/CVERecord?id=CVE-2026-40036
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40036.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-40036
Aliases
Published
2026-04-08T21:35:28Z
Modified
2026-10-24T10:51:12Z
Severity
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
Unfurl < 2026.04 - Denial of Service via Unbounded zlib Decompression
Details

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.

Database specific 
{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-409",
        "CWE-770"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40036.json"
}
References

Affected packages

Git / github.com/RyanDFIR/unfurl

Affected ranges

Type
GIT
Repo
https://github.com/RyanDFIR/unfurl
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
ae801d5fba62777d601e39b25e06ac102fafa4ec
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "2026.04"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "cpe":  "cpe:2.3:a:ryandfir:unfurl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "2026.04"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "original_tag":  "v2026.04",
            "range":  [
                {
                    "fixed":  "ae801d5fba62777d601e39b25e06ac102fafa4ec"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

Other
20200812
20201102
v2021.*
v2021.03.11
v2021.06.15
v2022.*
v2022.02
v2022.11
v2022.11.01
v2023.*
v2023.09
v2023.09.01
v2023.09.02
v2023.09.03
v2023.09.04
v2023.09.05
v2024.*
v2024.06
v2024.06.26
v2024.06.27
v2024.11
v2024.11.20
v2025.*
v2025.02
v2025.03
v2025.08

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40036.json"