CVE-2026-112018 cgltf through 1.15 Heap Out-of-Bounds Write via cgltf_accessor_unpack_floats()
Attackers can execute code or crash applications by supplying crafted glTF files with unchecked sparse indices to the cgltf library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-112018?
CVE-2026-112018 is a high-severity memory corruption vulnerability in jkuhlmann cgltf, published on 18 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
cgltf through 1.15 contains a heap out-of-bounds write vulnerability in cgltf_accessor_unpack_floats() that allows attackers to write outside the output buffer via unchecked sparse accessor indices. Attackers can supply a crafted glTF or GLB file with large sparse indices to corrupt heap memory, crash applications, and potentially execute code when cgltf_validate() is not called.
Weakness: CWE-787
Which versions are affected by CVE-2026-112018?
How do I fix CVE-2026-112018?
No fix has been published for CVE-2026-112018 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-112018 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112018 exists.
Sources
Also known as GHSA-6vjv-6x7m-3wjx.