SB2026070341 - Multiple vulnerabilities in onnx

Description

This security bulletin contains information about 2 vulnerabilities.

1) Heap-based buffer overflow (CVE-ID: N/A)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to disclose sensitive information or cause a denial of service.

The vulnerability exists due to a heap-based buffer overflow in Gemm_7_6::adapt_gemm_7_6() when processing a crafted model during version conversion. A remote attacker can trick the victim into processing a specially crafted model to disclose sensitive information or cause a denial of service.

User interaction is required to process the crafted model through onnx.version_converter.convert_version(model, 6) during opset downgrade from 7 to 6.

2) NULL pointer dereference (CVE-ID: CVE-2026-44512)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a null pointer dereference in Upsample_6_7::adapt_upsample_6_7() when processing a crafted model with an Upsample node that has zero inputs during version conversion. A remote attacker can trick the victim into opening a crafted model to cause a denial of service.

Debug builds abort with an assertion failure, while release builds crash with SIGSEGV.

Remediation

Install update from vendor's website.

References

• https://github.com/onnx/onnx/security/advisories/GHSA-p893-rvq9-2xf9
• https://github.com/onnx/onnx/security/advisories/GHSA-hwpq-hmq9-wj77
• https://github.com/onnx/onnx/pull/7813