CVE-2026-29628Public exploit

Service crash via unbounded material-name scan

Published Apr 13, 2026 · Updated Apr 13, 2026

Stack buffer overflow in tinyobjloader commit d56555b allows local users to crash a consuming process via a crafted .mtl file. In tinyobj_opt::LoadMtl, sscanf reads an oversized newmtl token with an unbounded %s conversion into the fixed-size local namebuf array. The experimental optimized parser must process the attacker-controlled material file; the demonstrated consequence is process termination.

CVSS severity6.2
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in tinyobjloader commit d56555b allows local users to crash a consuming process via a crafted .mtl file. In tinyobj_opt::LoadMtl, sscanf reads an oversized newmtl token with an unbounded %s conversion into the fixed-size local namebuf array. The experimental optimized parser must process the attacker-controlled material file; the demonstrated consequence is process termination.

The record

CVE
CVE-2026-29628
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.2CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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