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.
Metrics
Affected Vendors & Products
| Vendors | Products |
|---|---|
| Syoyo |
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References
History
Mon, 10 Aug 2026 12:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 `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. | 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. |
| Title | tinyobjloader-c - Stack Buffer Overflow in MTL Material File Line Parsing | tinyobjloader-c Stack Buffer Overflow in MTL Material File Line Parsing |
Mon, 10 Aug 2026 11:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | tinyobjloader-c Stack Buffer Overflow in MTL Material File Line Parsing | tinyobjloader-c - Stack Buffer Overflow in MTL Material File Line Parsing |
Fri, 07 Aug 2026 10:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Syoyo
Syoyo tinyobjloader-c |
|
| Vendors & Products |
Syoyo
Syoyo tinyobjloader-c |
Wed, 05 Aug 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Wed, 05 Aug 2026 13:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 `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. | |
| Title | tinyobjloader-c Stack Buffer Overflow in MTL Material File Line Parsing | |
| Weaknesses | CWE-121 | |
| References |
| |
| Metrics |
cvssV3_1
|
MITRE
Status: PUBLISHED
Assigner: TuranSec
Published: 2026-08-05T12:26:14.097Z
Updated: 2026-08-10T11:46:35.656Z
Reserved: 2026-08-05T12:23:34.967Z
Link: CVE-2026-71266
Vulnrichment
Updated: 2026-08-05T15:40:54.703Z
NVD
Status : Deferred
Published: 2026-08-05T13:24:50.843
Modified: 2026-08-26T17:13:24.800
Link: CVE-2026-71266
Redhat
No data.