CVE-2026-55758: Cc-Tweaked

Medium severity, CVSS 6.9. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Cc-Tweaked Cc-Tweaked: before 1.120.0 (fixed in 1.120.0)

Published 2026-08-27. Last modified 2026-09-09.