CVE-2026-71266

Summary

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.

Affected Software

Weaknesses

• CWE-121: CWE-121

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://github.com/syoyo/tinyobjloader-c
• https://github.com/syoyo/tinyobjloader-c/blob/master/tinyobj_loader_c.h

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