Vulnerability · Published Oct 18, 2026 · Assigned by VulnCheck

CVE-2026-112018cgltf through 1.15 Heap Out-of-Bounds Write via cgltf_accessor_unpack_floats()

High 7.0

In plain English

A high-severity out-of-bounds write in cgltf from jkuhlmann. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)7.0High

Exploit odds (30 days)0.2%top 90.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
jkuhlmann	cgltf	0 – through 1.15

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://hackmd.io/@haindpwn/cgltf-accessor-unpack-floats-sparse-oob technical-description
https://github.com/jkuhlmann/cgltf/blob/360db1a95480fe102ae9c69b27c5d101167ff5ba/cgltf.h#L2436-L2441 technical-description
https://github.com/jkuhlmann/cgltf product
VulnCheck Advisory: cgltf through 1.15 Heap Out-of-Bounds Write via cgltf_accessor_unpack_floats() third-party-advisory
https://hackmd.io/@haindpwn/cve-2026-112018-112019-cgltf-accessor-unpack-floats-sparse-oob exploit