What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-05 · updated 2026-10-24
• Weakness: CWE-121

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 products

• syoyo tinyobjloader-c: all versions

References

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

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