TI-2026-49934 Aliases CVE-2026-71266 GHSA-gr59-p4q8-r75g

tinyobjloader-c Stack Buffer Overflow in MTL Material File Line Parsing

LOW 35CWE-121Published 2026-08-05 · Updated 2026-08-10

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

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 via memcpy(linebuf, p, p_len), guarded only by . The identical vulnerable pattern is duplicated in a second function in the same file.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00174 6th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
syoyo	tinyobjloader-c	all versions	—	No fix listed	CNA

tinyobjloader-c Vendorsyoyo Affected all versions Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-71266
2026-10-03 Alias added: GHSA-gr59-p4q8-r75g

References

Advisory 2

TI-2026-74091 Heap out-of-bounds read in Tinyexr multipart EXR header parsing CVSS 4.0MEDIUM 6.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences