CVE•Published 2026-04-08•Modified 2026-07-24•1 article on news•5 live references•NVD data
CVE-2026-40035Ryandfir · Unfurl
Vulnerability data via NVD (ingested)
CVSS v3.1
9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS percentile
43
Exploit Prediction Scoring System · top 57% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2026-04-08
Modified 2026-07-24
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-40035Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Ryandfir Unfurl"All exposed Ryandfir Unfurl instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Unfurl"HTTP body or banner mentions "Unfurl" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-40035Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-40035Censys host search filtered to this CVE id.
grep.app
CVE-2026-40035Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-40035GitHub code search for direct mentions.
Google dork
"CVE-2026-40035" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-40035 on GitHub.