CVE-2026-71266

Stack corruption via unchecked material-line copy

Published Aug 5, 2026 · Updated Aug 5, 2026

Stack-based buffer overflow in tinyobjloader-c allows attackers to corrupt an application's stack via a crafted MTL material file. tinyobj_parse_and_index_mtl_file() copies an unchecked material-line length into the 4096-byte stack buffer linebuf after relying only on an assert that release builds remove. Exploitation requires an application to load an attacker-supplied OBJ/MTL asset and permits memory corruption within that application's process.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in tinyobjloader-c allows attackers to corrupt an application's stack via a crafted MTL material file. tinyobj_parse_and_index_mtl_file() copies an unchecked material-line length into the 4096-byte stack buffer linebuf after relying only on an assert that release builds remove. Exploitation requires an application to load an attacker-supplied OBJ/MTL asset and permits memory corruption within that application's process.

The record

CVE
CVE-2026-71266
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Syoyo Fujita
Product
tinyobjloader-c
Classifications
CWE-121, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Syoyo Fujita · tinyobjloader-cversion=0 <=*

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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