CVE-2024-11991: Dfinity Motoko

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Motoko's incremental garbage collector is impacted by an uninitialized memory access bug, caused by incorrect use of write barriers in a few locations. This vulnerability could potentially allow unauthorized read or write access to a Canister's memory. However, exploiting this bug requires the Canister to enable the incremental garbage collector or enhanced orthogonal persistence, which are non-default features in Motoko.

Affected products

• Dfinity Motoko: from 0.9.0, before 0.13.4 (fixed in 0.13.4)

Published 2024-12-09. Last modified 2026-06-17.