CVE-2026-44512Public exploit

Unrecoverable process crash via unchecked Upsample input access

Published Jul 8, 2026 · Updated Jul 8, 2026

Null pointer dereference in ONNX 1.9.0 through 1.21.0 allows local users to crash a consuming process via an untrusted model. Upsample_6_7::adapt_upsample_6_7() indexes node->inputs()[0] without verifying that the Upsample node has an input, producing SIGSEGV in release builds. Exploitation requires a consuming application to pass the malicious model to onnx.version_converter.convert_version(), and the resulting process crash is unrecoverable.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in ONNX 1.9.0 through 1.21.0 allows local users to crash a consuming process via an untrusted model. Upsample_6_7::adapt_upsample_6_7() indexes node->inputs()[0] without verifying that the Upsample node has an input, producing SIGSEGV in release builds. Exploitation requires a consuming application to pass the malicious model to onnx.version_converter.convert_version(), and the resulting process crash is unrecoverable.

The record

CVE
CVE-2026-44512
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
ONNX
Product
ONNX
Classifications
CWE-476, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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=>= 1.9.0, < 1.22.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

ONNX · ONNXversion=>= 1.9.0, < 1.22.0

Published CVSS scores

5.5GitHub, Inc.CVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1204.002Malicious File

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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