CVE-2026-112018

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.

CVSS 4.0

7.3CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.0CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-25)

CWE

CWE-787

Published

2026-10-18

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

References

• https://github.com/jkuhlmann/cgltf
• https://github.com/jkuhlmann/cgltf/blob/360db1a95480fe102ae9c69b27c5d101167ff5ba/cgltf.h#L2436-L2441
• https://hackmd.io/@haindpwn/cgltf-accessor-unpack-floats-sparse-oob
• https://www.vulncheck.com/advisories/cgltf-through-1.15-heap-out-of-bounds-write-via-cgltf-accessor-unpack-floats
• https://hackmd.io/@haindpwn/cve-2026-112018-112019-cgltf-accessor-unpack-floats-sparse-oob

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