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CC: Tweaked CVE-2026-55758

| EUVDEUVD-2026-67159 MEDIUM
Server-Side Request Forgery (SSRF) (CWE-918)
2026-08-27 GitHub_M
SSRF Java Cc Tweaked
6.9
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
6.9 MEDIUM
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/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
7.5 HIGH

AC:H captures the non-default RFC 8215 NAT64 deployment requirement; S:C and C:H reflect that internal systems including cloud metadata are reachable; no direct system integrity or availability impact.

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

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Aug 27, 2026 - 22:03 EUVD
Source Code Evidence Fetched
Aug 27, 2026 - 20:56 vuln.today
Analysis Generated
Aug 27, 2026 - 20:56 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Incomplete NAT64 prefix filtering in CC: Tweaked prior to 1.120.0 allows any Lua-capable Minecraft player on a dual-stack server to bypass SSRF protections and reach loopback, RFC 1918, cloud metadata, or internal API endpoints. The flaw resides in AddressPredicate.java, which correctly blocks the RFC 6052 Well-Known NAT64 prefix (64:ff9b::/96) but omits the RFC 8215 Local-Use prefix (64:ff9b:1::/48), enabling requests via http.request or http.websocket to mapped internal IPv4 addresses. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation The critical non-default condition is that the Minecraft server host must be running in a dual-stack environment with RFC 8215 Local-Use NAT64 (prefix 64:ff9b:1::/48) active - this is an operator-configured network feature, not present in standard single-stack or typical home/shared-hosting deployments. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N, score 6.9) accurately reflects the attack profile: network-accessible, no privileges needed, but with AT:P (Attack Requirements Present) encoding the critical constraint that the server must be running a dual-stack RFC 8215 NAT64 configuration - a decidedly non-default and relatively uncommon deployment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade CC: Tweaked to version 1.120.0, which adds the missing LOCAL_USE_IPV4_IPV6 (64:ff9b:1::/48) block to AddressPredicate.java as confirmed by commit d1bfb2571d3bde55529fac50d8303b7404499ec0 and advisory GHSA-2rrx-mch2-76cp (https://github.com/cc-tweaked/CC-Tweaked/security/advisories/GHSA-2rrx-mch2-76cp). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-55758 vulnerability details – vuln.today
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