{"id":"UBUNTU-CVE-2026-115920","details":"Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.2.1 until 1.22.0, ConvTranspose shape inference processes a weight tensor with fewer than three dimensions without a kernel_shape attribute by deriving an empty effective_kernel_shape and indexing it for the input's spatial dimensions. The flaw affects convTransposeShapeInference_opset11() and the current inference path, and an untrusted model that can pass onnx.checker.check_model() can crash onnx.shape_inference.infer_shapes(), causing denial of service without demonstrated confidentiality or integrity impact. This issue is fixed in version 1.22.0.","modified":"2026-10-28T20:17:45.657123064Z","published":"2026-10-26T18:17:00Z","upstream":["CVE-2026-115920"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-115920"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-115920"},{"type":"REPORT","url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/115xxx/cve-2026-115920.json"},{"type":"REPORT","url":"https://github.com/onnx/onnx/commit/2ec288908952eea9dcf48d4b197915e1f72c6abf"},{"type":"REPORT","url":"https://github.com/onnx/onnx/pull/7997"},{"type":"REPORT","url":"https://github.com/onnx/onnx/releases/tag/v1.22.0"},{"type":"REPORT","url":"https://github.com/onnx/onnx/security/advisories/ghsa-6pwm-x34p-fvj2"},{"type":"REPORT","url":"https://nvd.nist.gov/vuln/detail/cve-2026-115920"},{"type":"REPORT","url":"https://security-tracker.debian.org/tracker/cve-2026-115920"}],"affected":[{"package":{"name":"onnx","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/onnx?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.0+dfsg-3build1","1.7.0+dfsg-3build2","1.7.0+dfsg-3ubuntu1","1.7.0+dfsg-3ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"libonnx-testdata","binary_version":"1.7.0+dfsg-3ubuntu2"},{"binary_name":"libonnx1","binary_version":"1.7.0+dfsg-3ubuntu2"},{"binary_name":"libonnxifi","binary_version":"1.7.0+dfsg-3ubuntu2"},{"binary_name":"python3-onnx","binary_version":"1.7.0+dfsg-3ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115920.json"}},{"package":{"name":"onnx","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/onnx?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.1-3","1.13.1-3build1","1.14.1-2","1.14.1-2.1","1.14.1-2.1build1","1.14.1-2.1build2","1.14.1-2.1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.14.1-2.1ubuntu0.1~esm1","binary_name":"libonnx-testdata"},{"binary_name":"libonnx1t64","binary_version":"1.14.1-2.1ubuntu0.1~esm1"},{"binary_name":"python3-onnx","binary_version":"1.14.1-2.1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115920.json"}},{"package":{"name":"onnx","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/onnx?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.20.0-1","1.20.0-6"],"ecosystem_specific":{"binaries":[{"binary_name":"libonnx-testdata","binary_version":"1.20.0-6"},{"binary_version":"1.20.0-6","binary_name":"libonnx1l"},{"binary_name":"python3-onnx","binary_version":"1.20.0-6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115920.json"}},{"package":{"name":"onnx","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/onnx?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.17.0-3build1","1.20.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libonnx-testdata","binary_version":"1.20.0-1"},{"binary_name":"libonnx1t64","binary_version":"1.20.0-1"},{"binary_version":"1.20.0-1","binary_name":"python3-onnx"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115920.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}