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CVE-2026-71266— tinyobjloader-c Stack Buffer Overflow in MTL Material File Line Parsing

CVSS 7.8 · High

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
syoyotinyobjloader-c≤ *affected
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I. Basic Information for CVE-2026-71266

Vulnerability Information
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Vulnerability Title
tinyobjloader-c Stack Buffer Overflow in MTL Material File Line Parsing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
syoyotinyobjloader-c 0 ~ * -

II. Public POCs for CVE-2026-71266

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 8020 chars
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III. Intelligence Information for CVE-2026-71266

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Other References for CVE-2026-71266 (1)

IV. Related Vulnerabilities

Same vendor: syoyo
Same weakness: CWE-121

V. Comments for CVE-2026-71266

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