CVE-2026-56259 Crawl4AI - LLM Credential Exfiltration via base_url and Environment Variable Resolution

What is CVE-2026-56259?

CVE-2026-56259 is a high-severity vulnerability in Crawl4AI, published on 12 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Crawl4AI before 0.8.8 contains credential exfiltration vulnerabilities in the Docker API server that allow attackers to redirect LLM API calls to attacker-controlled endpoints and read arbitrary environment variables. Attackers can exploit the unauthenticated /md, /llm, and /llm/job endpoints by supplying a malicious base_url parameter and setting api_token to env:VARIABLE_NAME to exfiltrate provider API keys and server secrets including JWT SECRET_KEY for authentication bypass.

Weakness: CWE-200

Which versions are affected by CVE-2026-56259?

3 open source packages ship an affected version, including crawl4ai. It affects 1 product.

Products include Kidocode Crawl4ai.

How do I fix CVE-2026-56259?

Upgrade crawl4ai to 0.8.8 or later.

Is CVE-2026-56259 being exploited?

There is no known exploitation of CVE-2026-56259 in the wild and no public exploit code.

Other vulnerabilities in Crawl4AI

• CVE-2026-57572 Crawl4AI: Unauthenticated RCE via Chromium launch-argument injection in browser_config.extra_args Critical 10.0
• CVE-2026-26216 Crawl4AI < 0.8.0 Docker API Unauthenticated Remote Code Execution via Hooks Parameter Critical 10.0
• CVE-2026-53753 Crawl4AI: AST Sandbox Escape via gi_frame.f_back Chain - Pre-Auth RCE in Docker API Critical 9.8
• CVE-2026-57571 Crawl4AI arbitrary file write via download filename path traversal Critical 9.6
• CVE-2026-56265 Crawl4AI - Authentication Bypass via Hardcoded JWT Signing Key Critical 9.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-f989-c77f-r2cq, GHSA-mw9f-q68p-364x, PYSEC-2026-3448.