Path Traversal in Unclecode Crawl4ai
CVE-2026-91940
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/unclecode/crawl4ai/security/advisories/GHSA-xpp7-j28w-2gvx (vendor-advisory)
- www.vulncheck.com/advisories/crawl4ai-before-0.9.3-arbitrary-file-write-via-pdf… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91940?
- CVE-2026-91940 is a high-severity vulnerability in Unclecode Crawl4ai, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-09-15.
- How severe is CVE-2026-91940?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2026-91940 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.