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Crawl4ai CVE-2026-91940

| EUVDEUVD-2026-78797 HIGH
Path Traversal (CWE-22)
2026-09-15 VulnCheck GHSA-86m6-ccmv-j88p
8.7
CVSS 4.0 · Vendor: VulnCheck
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Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Sep 15, 2026 - 16:03 EUVD
Analysis Generated
Sep 15, 2026 - 16:01 vuln.today
CVE Published
Sep 15, 2026 - 15:18 cve.org
HIGH 8.7

DescriptionCVE.org

crawl4ai before 0.9.3 contains an arbitrary file write vulnerability in PDFContentScrapingStrategy where the _filter_untrusted_fields function fails to validate untrusted configuration fields. Attackers can submit crafted config bodies with malicious image_save_dir paths to write attacker-controlled bytes into any directory accessible to the service account.

AnalysisAI

Arbitrary file write in crawl4ai before 0.9.3 allows remote attackers to plant attacker-controlled bytes anywhere the service account can write, by abusing the image_save_dir path accepted in a scrape configuration. The flaw sits in PDFContentScrapingStrategy, where _filter_untrusted_fields fails to validate untrusted configuration fields, so a crafted config body escapes the intended image output directory (CWE-22). …

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CVE-2026-91940 vulnerability details – vuln.today

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