PHP worker crash via overflowing unpack bounds
Published Feb 3, 2026 · Updated Feb 3, 2026
Integer overflow in Wikimedia Foundation Scribunto and LuaSandbox allows remote attackers to crash a PHP worker using crafted Lua unpack bounds. The custom unpack implementation subtracts large integer bounds without safe overflow handling, miscomputes the result count, and overruns the Lua stack until the process segfaults. Exploitation requires a network-reachable path that executes untrusted Lua; the reported consequence is interruption of the affected PHP worker, not data access or modification.
Summary
What happened
Integer overflow in Wikimedia Foundation Scribunto and LuaSandbox allows remote attackers to crash a PHP worker using crafted Lua unpack bounds. The custom unpack implementation subtracts large integer bounds without safe overflow handling, miscomputes the result count, and overruns the Lua stack until the process segfaults. Exploitation requires a network-reachable path that executes untrusted Lua; the reported consequence is interruption of the affected PHP worker, not data access or modification.
The record
- CVE
- CVE-2025-67482
- Published
- Feb 3, 2026
- Updated
- Feb 3, 2026
- Vendor
- Wikimedia Foundation
- Product
- LuaSandbox
- Classifications
- T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 3, 2026CVE publishedPublication date reported by the CVE source.
- Feb 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=* <fea2304f8f6ab30314369a612f4f5b165e68e95a
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Attacks
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