CVE-2026-42248

Code execution via unchecked update executables

Published Apr 29, 2026 · Updated Apr 29, 2026

Download integrity failure in Ollama for Windows 0.12.10 through 0.17.5 allows attackers to execute supplied update payloads. The Windows updater's verifyDownload function returns success without checking an executable's signature or trust before staging it. Exploitation requires control of the update payload delivered to the Windows client; the silent update path then runs the substituted installer without user interaction.

CVSS severity7.7
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Download integrity failure in Ollama for Windows 0.12.10 through 0.17.5 allows attackers to execute supplied update payloads. The Windows updater's verifyDownload function returns success without checking an executable's signature or trust before staging it. Exploitation requires control of the update payload delivered to the Windows client; the silent update path then runs the substituted installer without user interaction.

The record

CVE
CVE-2026-42248
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
Ollama
Product
Ollama
Classifications
CWE-494, T1195.002
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.12.10 <=0.17.5

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Ollama · Ollamaversion=0.12.10 <=0.17.5

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.7CERT.PLCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-494Download of Code Without Integrity Check
T1195.002Compromise Software Supply Chain

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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