Vulnerability · Published Aug 5, 2026 · Assigned by TuranSec
CVE-2026-71266tinyobjloader-c Stack Buffer Overflow in MTL Material File Line Parsing
High 7.8
In plain English
A high-severity stack buffer overflow in tinyobjloader-c from syoyo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 93.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
tinyobjloader-c's tinyobj_parse_and_index_mtl_file (tinyobj_loader_c.h) reads each line of a .mtl material file into a fixed 4096-byte stack buffer via memcpy(linebuf, p, p_len), guarded only by . The identical vulnerable pattern is duplicated in a second function in the same file.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | goxel | no fix listed | UBUNTU-CVE-2026-71266 |
| Ubuntu:24.04:LTS | goxel | no fix listed | UBUNTU-CVE-2026-71266 |
| Ubuntu:26.04:LTS | goxel | no fix listed | UBUNTU-CVE-2026-71266 |
| Ubuntu:26.10 | goxel | no fix listed | UBUNTU-CVE-2026-71266 |
| Ubuntu:26.10 | raylib | no fix listed | UBUNTU-CVE-2026-71266 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| syoyo | tinyobjloader-c | 0 – through * |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://github.com/syoyo/tinyobjloader-c third-party-advisory
- https://github.com/syoyo/tinyobjloader-c/blob/master/tinyobj_loader_c.h third-party-advisory