CVE-2026-40959
Publication date 16 April 2026
Last updated 6 June 2026
Ubuntu priority
Description
Luanti 5 before 5.15.2, when LuaJIT is used, allows a Lua sandbox escape via a crafted mod.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| luanti | 26.04 LTS resolute |
Fixed 5.10.0+dfsg-5+deb13u1build0.26.04.1
|
| 25.10 questing |
Fixed 5.10.0+dfsg-5+deb13u1build0.25.10.1
|
|
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
9.3 · Critical
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Changed |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-8366-1
- Luanti vulnerabilities
- 2 June 2026
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-40959
- https://github.com/luanti-org/luanti/security/advisories/GHSA-g596-mf82-w8c3
- https://github.com/luanti-org/luanti/commit/8a929dfb97aa08337f49ba1bb96a56d6557dc896 (master)
- https://github.com/luanti-org/luanti/commit/53cef183e2a85a4daff84ac1a9a7946f940da8f8 (5.15.2)