CVE-2026-53754: CWE-918: Server-Side Request Forgery (SSRF) in unclecode crawl4ai
CVE-2026-53754 is a Server-Side Request Forgery (SSRF) vulnerability in the open-source web crawler crawl4ai prior to version 0.8.8. The vulnerability arises because the Docker API server's SSRF protection used an incomplete IPv4/IPv6 CIDR blocklist, allowing attackers to bypass filters by encoding internal IPv4 addresses in IPv6 transition forms or using the IPv6 unspecified address. Since the Docker API is unauthenticated by default, attackers can exploit this to reach internal services and cloud metadata endpoints without credentials. The issue is fixed in version 0.8.8.
AI Analysis
Technical Summary
crawl4ai versions before 0.8.8 have an SSRF vulnerability in the Docker API server due to incomplete CIDR blocklisting in the SSRF protection functions (validate_webhook_url and validate_url_destination). This allows attackers to bypass the filter by using IPv6 transition forms or the IPv6 unspecified address to access internal network resources, including cloud metadata endpoints like 169.254.169.254. The Docker API is unauthenticated by default (jwt_enabled: false), so exploitation requires no credentials. The vulnerability is addressed in version 0.8.8.
Potential Impact
An unauthenticated attacker can exploit this SSRF vulnerability to access internal services and sensitive cloud metadata endpoints, potentially leading to information disclosure. The vulnerability does not impact integrity or availability according to the CVSS vector, but it has high confidentiality impact.
Mitigation Recommendations
Upgrade crawl4ai to version 0.8.8 or later, where this SSRF vulnerability is fixed. Since the Docker API is unauthenticated by default, enabling authentication (jwt_enabled: true) can also reduce risk. Patch status is confirmed fixed in 0.8.8.
CVE-2026-53754: CWE-918: Server-Side Request Forgery (SSRF) in unclecode crawl4ai
Description
CVE-2026-53754 is a Server-Side Request Forgery (SSRF) vulnerability in the open-source web crawler crawl4ai prior to version 0.8.8. The vulnerability arises because the Docker API server's SSRF protection used an incomplete IPv4/IPv6 CIDR blocklist, allowing attackers to bypass filters by encoding internal IPv4 addresses in IPv6 transition forms or using the IPv6 unspecified address. Since the Docker API is unauthenticated by default, attackers can exploit this to reach internal services and cloud metadata endpoints without credentials. The issue is fixed in version 0.8.8.
CVSS v3.1
Score 7.5high
Affected software
pkg:github/unclecode/crawl4aiRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
crawl4ai versions before 0.8.8 have an SSRF vulnerability in the Docker API server due to incomplete CIDR blocklisting in the SSRF protection functions (validate_webhook_url and validate_url_destination). This allows attackers to bypass the filter by using IPv6 transition forms or the IPv6 unspecified address to access internal network resources, including cloud metadata endpoints like 169.254.169.254. The Docker API is unauthenticated by default (jwt_enabled: false), so exploitation requires no credentials. The vulnerability is addressed in version 0.8.8.
Potential Impact
An unauthenticated attacker can exploit this SSRF vulnerability to access internal services and sensitive cloud metadata endpoints, potentially leading to information disclosure. The vulnerability does not impact integrity or availability according to the CVSS vector, but it has high confidentiality impact.
Mitigation Recommendations
Upgrade crawl4ai to version 0.8.8 or later, where this SSRF vulnerability is fixed. Since the Docker API is unauthenticated by default, enabling authentication (jwt_enabled: true) can also reduce risk. Patch status is confirmed fixed in 0.8.8.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-10T17:48:40.546Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3ad655eed863c81e79458e
Added to database: 06/23/2026, 18:54:13 UTC
Last enriched: 06/23/2026, 19:09:57 UTC
Last updated: 06/24/2026, 01:11:24 UTC
Views: 8
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