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CVE-2026-27489 affects Open Neural Network Exchange (ONNX) versions prior to 1.21.0. The vulnerability is a path traversal issue involving symlink handling that allows files outside the intended model directory or other user-provided directory to be accessed. By leveraging a symlink, an attacker can cause ONNX to resolve and read arbitrary files from locations outside the expected filesystem boundary. The issue results in unauthorized file disclosure rather than modification or code execution. The vulnerability was patched in ONNX 1.21.0.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible vulnerability whose CVSS vectors indicate low-complexity exploitation without authentication or user interaction, with high confidentiality impact and no integrity or availability impact. The affected product and underlying flaw are not identified. Exploits are available, and a patch publication date of June 1, 2026 is listed.
A path traversal vulnerability via symlink in ONNX prior to version 1.21.0 that allows reading arbitrary files outside the model or user-provided directory.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.