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CVE-2026-55758— CC: Tweaked: Incomplete fix for GHSA-5jh9-2h63-pw4q: RFC 8215 NAT64 prefix (64:ff9b:1::/96) bypasses SSRF protection

Quick assessment

Affected
cc-tweaked CC-Tweaked
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CC: Tweaked 是 Minecraft 的一个模组，为游戏增添了可编程的计算机、海龟（Turtles）等功能。在 1.120.0 版本之前，位于 中的 SSRF（服务器端请求伪造）防护机制仅阻止了 RFC 6052 定义的 NAT64 前缀，但遗漏了 RFC 8215 定义的 本地使用前缀。在启用 RFC 8215 NAT64 的双栈服务器上，能够执行 Lua 代码的未认证用户可以将 或 指向 范围内的地址，从而访问回环地址、RFC 1918 私有地址、云元数据服务或内部 API 端点，这是因为 未将映射后

CVSS 6.9 · Medium
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I. Basic Information for CVE-2026-55758

Vulnerability Information
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Vulnerability Title
CC: Tweaked: Incomplete fix for GHSA-5jh9-2h63-pw4q: RFC 8215 NAT64 prefix (64:ff9b:1::/96) bypasses SSRF protection
Source: CVE Program / CVE List V5
Vulnerability Description
CC: Tweaked is a mod for Minecraft which adds programmable computers, turtles, and more to the game. Prior to 1.120.0, the SSRF protection in projects/core/src/main/java/dan200/computercraft/core/apis/http/options/AddressPredicate.java blocks the RFC 6052 64:ff9b::/96 NAT64 prefix but omits the RFC 8215 64:ff9b:1::/48 local-use prefix. On a dual-stack server using RFC 8215 NAT64, an unauthenticated user who can execute Lua code can use http.request or http.websocket with an address under 64:ff9b:1::/48 to reach loopback, RFC 1918, cloud metadata, or internal API endpoints because PrivatePattern.matches() does not classify the mapped IPv6 address as private. This issue is fixed in version 1.120.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
cc-tweaked CC-Tweaked < 1.120.0 -

II. Public POCs for CVE-2026-55758

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III. Intelligence Information for CVE-2026-55758

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Patches & Fixes for CVE-2026-55758 (1)

Vendor Advisories for CVE-2026-55758 (1)

IV. Related Vulnerabilities

Same product: CC-Tweaked
Same vendor: cc-tweaked
Same weakness: CWE-918

V. Comments for CVE-2026-55758

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