{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-71266", "assignerOrgId": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "state": "PUBLISHED", "assignerShortName": "TuranSec", "dateReserved": "2026-08-05T12:23:34.967Z", "datePublished": "2026-08-05T12:26:14.097Z", "dateUpdated": "2026-08-05T12:26:14.097Z"}, "containers": {"cna": {"title": "tinyobjloader-c Stack Buffer Overflow in MTL Material File Line Parsing", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-121", "cweId": "CWE-121", "type": "CWE"}]}], "affected": [{"vendor": "syoyo", "product": "tinyobjloader-c", "programFiles": ["tinyobj_loader_c.h"], "versions": [{"version": "0", "lessThanOrEqual": "*", "status": "affected", "versionType": "custom"}], "defaultStatus": "unaffected"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/syoyo/tinyobjloader-c"}, {"url": "https://github.com/syoyo/tinyobjloader-c/blob/master/tinyobj_loader_c.h"}], "credits": [{"lang": "en", "value": "Alibek Baxtiyorov", "type": "finder"}], "providerMetadata": {"orgId": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "shortName": "TuranSec", "dateUpdated": "2026-08-05T12:26:14.097Z"}}}}

{}

{}

{}

{}