CVE-2026-71266

tinyobjloader-c Stack Buffer Overflow in MTL Material File Line Parsing

7.8 High

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.17%Unchanged since Aug 6, 2026

What each source reports

CVE List Score used 7.8

tinyobjloader-c Stack Buffer Overflow in MTL Material File Line Parsing

Record: CVE-2026-71266
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-121
Updated: 2026-11-02

EUVDEUVD-2026-53351 7.8

Record: EUVD-2026-53351
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-gr59-p4q8-r75g 7.8

tinyobjloader-c's tinyobj_parse_and_index_mtl_file() (tinyobj_loader_c.h) reads each line of a ...

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 linebuf via memcpy(linebuf, p, p_len), guarded only by assert(p_len < 4095). Because assert() compiles to a no-op under -DNDEBUG (standard for release builds), a crafted .mtl file containing a line (e.g. a "newmtl" material name) longer than 4096 bytes overflows linebuf into the adjacent stack variable namebuf and beyond, corrupting the stack of any application that loads attacker-supplied 3D model/material files. The identical vulnerable pattern is duplicated in a second function in the same file.

Record: GHSA-gr59-p4q8-r75g
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-121
Updated: 2026-11-02

NVD 7.8

Record: CVE-2026-71266
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-121
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-71266 7.8

Record: UBUNTU-CVE-2026-71266
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

syoyo tinyobjloader-c

Affected packages

Affected packages
Package	Affected	Fixed
`goxel` Ubuntu:18.04:LTS	All versions, plus listed versions 0.7.1-20.7.2-1	None known
`goxel` Ubuntu:20.04:LTS	All versions, plus listed versions 0.8.1-10.8.1-1build1	None known
`goxel` Ubuntu:22.04:LTS	All versions, plus listed versions 0.10.6-30.10.8-1	None known
`goxel` Ubuntu:24.04:LTS	All versions, plus listed versions 0.11.0-1.10.11.0-1.1build20.11.0-1.1build3	None known
`goxel` Ubuntu:26.10	All versions, plus listed versions 0.11.0-1.1build40.15.1-1ubuntu1	None known
`raylib` Ubuntu:26.10	All versions, plus listed versions 6.0+ds-16.0+ds-2	None known
`goxel` Ubuntu:26.04:LTS	All versions, plus listed versions 0.11.0-1.1build30.11.0-1.1build4	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-71266 is a high vulnerability (CVSS 7.8) in Syoyo Tinyobjloader-c, published August 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. No source names a fixed version.