CVE-2026-47695 in CC-Tweaked
Summary
by MITRE • 07/22/2026
CC: Tweaked is a mod for Minecraft which adds programmable computers, turtles, and more to the game. Prior to version 1.119.0, CC-Tweaked's HTTP API (`http.request`, `http.websocket`) blocks requests to private network ranges to prevent server-side request forgery (SSRF). This protection can be bypassed on IPv6-capable servers using NAT64 well-known prefix addresses (`64:ff9b::/96`). An attacker who can execute Lua code can reach any internal IPv4 service that the filter is intended to block, by addressing it as `http://[64:ff9b::<ipv4-as-hex>]/` instead of its direct IPv4 address. This affects any CC-Tweaked deployment on a network with NAT64 routing — a configuration that is standard on AWS, GCP, and other cloud platforms when using IPv6-only subnets. Version 1.119.0 fixes the issue.
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Analysis
by VulDB Data Team • 07/22/2026
The vulnerability in CC-Tweaked versions prior to 1.119.0 represents a critical server-side request forgery weakness that undermines fundamental network security controls. This flaw specifically impacts the mod's HTTP API implementation where developers had implemented protective measures against private network range access to prevent unauthorized internal network probing and data exfiltration. The protection mechanism was designed to block requests to private IPv4 address ranges such as 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16, which are commonly used in internal network infrastructures. However, the security implementation contained a significant bypass mechanism that exploited IPv6 networking capabilities through NAT64 translation mechanisms.
The technical exploitation occurs through the use of well-known NAT64 prefix addresses, specifically the 64:ff9b::/96 range defined in RFC 6052, which serves as a translation mechanism between IPv4 and IPv6 networks. When an attacker with Lua execution capabilities attempts to access internal services, they can circumvent the IPv4 filtering by constructing IPv6 addresses that map to the desired private IPv4 targets through the NAT64 prefix. This allows attackers to reach any internal service that would normally be blocked, effectively neutralizing the security controls. The vulnerability demonstrates a classic case of protocol-level bypass where the protection mechanism was implemented at the wrong layer of abstraction, failing to account for IPv6 addressing capabilities and translation mechanisms.
The operational impact of this vulnerability extends significantly in cloud environments where IPv6-only subnets are standard practice, particularly on major cloud platforms including Amazon Web Services and Google Cloud Platform. These environments typically implement NAT64 routing as part of their IPv6 network configurations, making the vulnerability exploitable in virtually all CC-Tweaked deployments that operate within such networks. The consequence is that any user who can execute arbitrary Lua code within the CC-Tweaked environment gains access to internal services that should remain protected from external reach, potentially exposing database servers, internal APIs, and other sensitive infrastructure components. This represents a severe privilege escalation vulnerability that transforms local code execution into network reconnaissance and exploitation capabilities.
This vulnerability aligns with CWE-918, Server-Side Request Forgery, which describes weaknesses where applications fail to properly validate or restrict external resource access. The implementation also reflects ATT&CK technique T1071.004 for Application Layer Protocol: DNS, as the bypass relies on understanding and leveraging IPv6 networking protocols. The fix implemented in version 1.119.0 required comprehensive network address validation that accounts for both IPv4 and IPv6 addressing schemes, ensuring that all requests are properly filtered regardless of how they might be expressed in the request URI. Organizations using CC-Tweaked should immediately upgrade to version 1.119.0 or later and conduct thorough security assessments of their deployments to ensure proper network segmentation controls remain effective. The vulnerability serves as a reminder of the importance of considering all possible protocol pathways when implementing network access controls, particularly in environments where multiple addressing schemes coexist.