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High · 7.5 Public exploit CVE-2026-91940 EUVD-2026-78797GHSA-86m6-ccmv-j88p

crawl4ai before 0.9.3 Arbitrary File Write via PDFContentScrapingStrategy

Published Sep 15, 2026 · Updated Sep 15, 2026 · Assigned by VulnCheck

Vendor: unclecode Product: Crawl4AI

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

VendorProductAffectedFixed
unclecode crawl4ai 0.9.0 – < 0.9.3 0.9.3

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • BiiTts/CVE-2026-91940-crawl4ai-Arbitrary-File-Write ★ 0 · Oct 8, 2026

    CVE-2026-91940: arbitrary file write in crawl4ai <=0.9.2 via the untrusted-config gate (PDFContentScrapingStrategy image_save_dir). Analysis, reproduction harness and verified 0.9.2 vs 0.9.3 boundary.

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References