Arbitrary File Write Vulnerability in Crawl4AI by UncleCode
CVE-2026-56258

9.2CRITICAL

Key Information:

Vendor

Crawl4ai

Status
Crawl4ai
Vendor
CVE Published:
23 June 2026

What is CVE-2026-56258?

Crawl4AI prior to version 0.8.8 is vulnerable to an arbitrary file write issue found in its screenshot and PDF endpoints. This vulnerability allows unauthenticated attackers to exploit insufficient path validation, utilizing symlink and time-of-check-time-of-use (TOCTOU) attacks on the output_path parameter. Consequently, attackers can write files outside of the intended directory structure, which may lead to arbitrary file creation and potential code execution on systems where the runtime user possesses write access to critical executable or cron locations.

Affected Version(s)

Crawl4AI 0 < 0.8.8

Crawl4AI 0.8.8

References

https://github.com/unclecode/crawl4ai/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/crawl4ai-arbitrary-f...
third-party-advisory

CVSS V4

Score:
9.2
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.