Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

CVE-2026-91940crawl4ai before 0.9.3 Arbitrary File Write via PDFContentScrapingStrategy

High 7.5

In plain English

A high-severity path traversal in crawl4ai from unclecode. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 60.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
unclecode	crawl4ai	0.9.0 – before 0.9.3

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

GitHub Security Advisory (GHSA-xpp7-j28w-2gvx) vendor-advisory
VulnCheck Advisory: crawl4ai before 0.9.3 Arbitrary File Write via PDFContentScrapingStrategy third-party-advisory