CVE-2026-40035CRITICAL 9.1EPSS p42.0%

CVE-2026-40035CVE-2026-40035

Description

Unfurl through 2025.08 contains an improper input validation vulnerability in config parsing that enables Flask debug mode by default. The debug configuration value is read as a string and passed directly to app.run(), causing any non-empty string to evaluate truthy, allowing attackers to access the Werkzeug debugger and disclose sensitive information or achieve remote code execution.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.56% probability of exploitation · percentile 42.0% · 2026-06-19T12:03:05Z
Published2026-04-08
Last modified2026-04-17

Underlying weaknesses· 1

CWE-489

References

  1. https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-vg9h-jx4v-cwx2
  2. https://www.vulncheck.com/advisories/dfir-unfurl-werkzeug-debugger-exposure-via-string-config-parsing
  3. https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-vg9h-jx4v-cwx2

1

TypeTargetConfidenceTier
WeaknessActive Debug Codecwe-4890%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.