Vulnerability · CVE-2026-42248
Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables.
Published Apr 29, 2026 · corrected/updated Jun 17, 2026 · ollama ollama · evidence confidence high
Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker‑supplied executables to be accepted and later executed by the application. Critically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness. Maintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-42248 is a high public vulnerability record for ollama ollama. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether ollama ollama is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: ollama/ollama. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 7.7, EPSS 0.7%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-494. Sources contributing to this record: cve_org, epss, metasploit, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Apr 29, 2026 · NIST NVD
Detected
Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker‑supplied executables to be accepted and later execute
Jun 17, 2026 · NIST NVD
Updated
Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker‑supplied executables to be accepted and later execute
Affected
- cpe ollama/ollamaversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-42248
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-42248
30-day exploitation probability 0.7%
first.org - Metasploit ModulesPublic exploit moduleexploit_windows/persistence/ollama_auto_update
Public module reference (excellent). Module source is not copied into this catalog.
rapid7.com - NIST NVDVulnerability recordCVE-2026-42248
Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is perfor
nvd.nist.gov