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CVE-2026-40036

Ryandfir Unfurl denial of service

7.5 HIGHPublic exploitEPSS 0.79%
  1. Published8 Apr 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Ryandfir Unfurl< 2026.04

Remediation

Fixed in
Ryandfir Unfurl≥ 2026.04

References

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Frequently asked

Is CVE-2026-40036 being actively exploited?

CVE-2026-40036 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.79%.

How severe is CVE-2026-40036?

CVE-2026-40036 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.79% probability of exploitation.

Which products are affected by CVE-2026-40036?

Affected products include Ryandfir Unfurl.

How do I fix CVE-2026-40036?

Upgrade affected software to a fixed version, for example Ryandfir Unfurl 2026.04 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40036 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.