What is CVE-2026-42249?

CVE-2026-42249 is a critical-severity vulnerability in Microsoft Windows, classified under Path Traversal. CVSS score: 9.8/10. Published 2026-04-29.

How severe is CVE-2026-42249?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Path Traversal in Microsoft Windows

CVE-2026-42249

Ollama for Windows contains a Remote Code Execution vulnerability in its update mechanism due to improper handling of attacker‑controlled HTTP response headers. When downloading updates, the application constructs local file paths using va…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.003 (53.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Microsoft Windows
Ollama — versions 0.12.10

Weakness classification (CWE)

References

cvd@cert.pl (Third Party Advisory, third-party-advisory)
cvd@cert.pl (Product, product)

Frequently asked questions

What is CVE-2026-42249?: CVE-2026-42249 is a critical-severity vulnerability in Microsoft Windows, classified under Path Traversal. CVSS score: 9.8/10. Published 2026-04-29.
How severe is CVE-2026-42249?: Critical severity. CVSS v3 base score is 9.8 out of 10.