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CVE-2026-42248 is a Windows-specific updater vulnerability in Ollama in which downloaded update executables are not subjected to integrity or authenticity verification before being staged or executed. According to the provided content, the Windows implementation of the update verification routine unconditionally returns success, so digital signature validation, trust-chain verification, or equivalent authenticity checks are effectively skipped. As a result, if an attacker can influence the update response or supply a malicious update payload, Ollama for Windows may accept an attacker-provided PE executable as a legitimate update package. The issue is especially severe because Ollama for Windows performs silent automatic updates, allowing a malicious payload to be installed and later executed without meaningful user awareness. Tested vulnerable versions are 0.12.10 through 0.17.5; other versions may also be affected but were not tested.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows Ollama updater flaw where verifyDownload() performs no signature verification, allowing arbitrary PE binaries to be accepted as valid updates if an attacker can influence the update source.
A code integrity verification flaw in Ollama for Windows' update mechanism that allows attacker-supplied update executables to be accepted and executed because downloaded updates are not properly verified.
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.