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Crawl4AI CVE-2026-56259

| EUVDEUVD-2026-43226 HIGH
Information Exposure (CWE-200)
2026-07-12 VulnCheck GHSA-mw9f-q68p-364x
Authentication Bypass Docker Information Disclosure Crawl4ai
8.8
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.8 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.2 HIGH

Remote, unauthenticated, low-complexity access to exposed endpoints (AV:N/AC:L/PR:N/UI:N); high confidentiality from secret disclosure, limited integrity via leaked auth key, no availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Jul 12, 2026 - 13:01 EUVD
CVE Published
Jul 12, 2026 - 12:48 cve.org
HIGH 8.8
Analysis Generated
Jul 12, 2026 - 12:36 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Credential exfiltration in Crawl4AI's Docker API server (all versions before 0.8.8) lets remote unauthenticated attackers steal secrets from the host. By abusing the exposed /md, /llm, and /llm/job endpoints, an attacker supplies a malicious base_url to redirect outbound LLM API calls and sets api_token to the special form env:VARIABLE_NAME, causing the server to resolve and leak arbitrary environment variables - including provider API keys and the JWT SECRET_KEY, which in turn enables full authentication bypass. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Locate exposed Crawl4AI Docker API
Delivery
Send crafted request to /llm endpoint
Exploit
Set base_url to attacker server, api_token=env:SECRET
Execution
Server resolves and forwards env variables
Persist
Capture provider keys and JWT SECRET_KEY
Impact
Forge tokens to bypass authentication
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the Crawl4AI Docker API server (version before 0.8.8) be deployed and network-reachable by the attacker, with its unauthenticated /md, /llm, or /llm/job endpoints accessible. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are largely consistent and point to a genuine priority for anyone exposing the Crawl4AI Docker API. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker discovers an internet-exposed Crawl4AI Docker API server and sends an unauthenticated POST to /llm with base_url pointing at their own listener and api_token set to env:OPENAI_API_KEY (then env:SECRET_KEY). The server dutifully resolves each environment variable and forwards it to the attacker's endpoint, handing over the LLM provider key and the JWT signing secret. …
Remediation Vendor-released patch: upgrade Crawl4AI to 0.8.8 or later, which is the primary and definitive fix (see the vendor advisory GHSA-f989-c77f-r2cq at https://github.com/unclecode/crawl4ai/security/advisories/GHSA-f989-c77f-r2cq). … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-56259 vulnerability details – vuln.today
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