CVE-2026-39020

Application crash via unhandled OBJ special values

Published Sep 9, 2026 · Updated Sep 9, 2026

Improper input validation in Wings3D 2.4.1 allows local users to crash the application by importing a crafted Wavefront OBJ file. The Erlang OBJ parser passes IEEE 754 special floating-point values into a pattern match that lacks a matching clause, raising an unhandled function_clause exception. Exploitation requires a user to import the malicious file, and the demonstrated impact is termination of the Wings3D process rather than code execution or data modification.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Wings3D 2.4.1 allows local users to crash the application by importing a crafted Wavefront OBJ file. The Erlang OBJ parser passes IEEE 754 special floating-point values into a pattern match that lacks a matching clause, raising an unhandled function_clause exception. Exploitation requires a user to import the malicious file, and the demonstrated impact is termination of the Wings3D process rather than code execution or data modification.

The record

CVE
CVE-2026-39020
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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

5.5MITRECVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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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