# CVE-2026-40959: luanti: Luanti 5 before 5.15.2, when LuaJIT is used, allows a Lua sandbox escape via a crafted mod.

CVE-2026-40959 is fixed in 6 products on 1 platform, first by luanti 5.10.0+dfsg-5+deb13u1build0.25.10.1, released April 15, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-40959
- Priority: Urgent
- CVSS: 9.3 (critical)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 15, 2026

## Description

Luanti 5 before 5.15.2, when LuaJIT is used, allows a Lua sandbox escape via a crafted mod.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | luanti Debian 13.5 (trixie) | 5.10.0+dfsg-5+deb13u1 | [DEBIAN-CVE-2026-40959](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40959.md) | May 15, 2026 |
| Linux | luanti Debian 14 | 5.15.2+dfsg-1 | [DEBIAN-CVE-2026-40959](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40959.md) | May 15, 2026 |
| Linux | luanti Ubuntu 25.10 (questing) | 5.10.0+dfsg-5+deb13u1build0.25.10.1 | [luanti 5.10.0+dfsg-5+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-luanti-5.10.0-dfsg-5-deb13u1build0.25.10.1.md) | Apr 15, 2026 |
| Linux | luanti Ubuntu 26.04.1 LTS (resolute) | 5.10.0+dfsg-5+deb13u1build0.26.04.1 | [luanti 5.10.0+dfsg-5+deb13u1build0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-luanti-5.10.0-dfsg-5-deb13u1build0.26.04.1.md) | Apr 22, 2026 |
| Linux | luanti-data Ubuntu 25.10 (questing) | 5.10.0+dfsg-5+deb13u1build0.25.10.1 | [luanti-data 5.10.0+dfsg-5+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-luanti-data-5.10.0-dfsg-5-deb13u1build0.25.10.1.md) | Apr 15, 2026 |
| Linux | luanti-data Ubuntu 26.04.1 LTS (resolute) | 5.10.0+dfsg-5+deb13u1build0.26.04.1 | [luanti-data 5.10.0+dfsg-5+deb13u1build0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-luanti-data-5.10.0-dfsg-5-deb13u1build0.26.04.1.md) | Apr 22, 2026 |
| Linux | luanti-server Ubuntu 25.10 (questing) | 5.10.0+dfsg-5+deb13u1build0.25.10.1 | [luanti-server 5.10.0+dfsg-5+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-luanti-server-5.10.0-dfsg-5-deb13u1build0.25.10.1.md) | Apr 15, 2026 |
| Linux | luanti-server Ubuntu 26.04.1 LTS (resolute) | 5.10.0+dfsg-5+deb13u1build0.26.04.1 | [luanti-server 5.10.0+dfsg-5+deb13u1build0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-luanti-server-5.10.0-dfsg-5-deb13u1build0.26.04.1.md) | Apr 22, 2026 |
| Linux | minetest Ubuntu 25.10 (questing) | 5.10.0+dfsg-5+deb13u1build0.25.10.1 | [minetest 5.10.0+dfsg-5+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-minetest-5.10.0-dfsg-5-deb13u1build0.25.10.1.md) | Apr 15, 2026 |
| Linux | minetest Ubuntu 26.04.1 LTS (resolute) | 5.10.0+dfsg-5+deb13u1build0.26.04.1 | [minetest 5.10.0+dfsg-5+deb13u1build0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-minetest-5.10.0-dfsg-5-deb13u1build0.26.04.1.md) | Apr 22, 2026 |
| Linux | minetest-data Ubuntu 25.10 (questing) | 5.10.0+dfsg-5+deb13u1build0.25.10.1 | [minetest-data 5.10.0+dfsg-5+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-minetest-data-5.10.0-dfsg-5-deb13u1build0.25.10.1.md) | Apr 15, 2026 |
| Linux | minetest-data Ubuntu 26.04.1 LTS (resolute) | 5.10.0+dfsg-5+deb13u1build0.26.04.1 | [minetest-data 5.10.0+dfsg-5+deb13u1build0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-minetest-data-5.10.0-dfsg-5-deb13u1build0.26.04.1.md) | Apr 22, 2026 |
| Linux | minetest-server Ubuntu 25.10 (questing) | 5.10.0+dfsg-5+deb13u1build0.25.10.1 | [minetest-server 5.10.0+dfsg-5+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-minetest-server-5.10.0-dfsg-5-deb13u1build0.25.10.1.md) | Apr 15, 2026 |
| Linux | minetest-server Ubuntu 26.04.1 LTS (resolute) | 5.10.0+dfsg-5+deb13u1build0.26.04.1 | [minetest-server 5.10.0+dfsg-5+deb13u1build0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-minetest-server-5.10.0-dfsg-5-deb13u1build0.26.04.1.md) | Apr 22, 2026 |

---

Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.