CVE-2026-42249

CVE Enrichment

CVSS: 7.7 HIGH
EPSS: 0.99%
EPSS Percentile: 61.35%
CISA KEV: Not listed

Description

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 values derived from HTTP headers without validation. These values are passed directly to filepath.Join, allowing path traversal sequences (../) to be resolved and enabling files to be written outside the intended update staging directory. An attacker who can influence update responses can exploit this flaw to write arbitrary executables to attacker‑chosen locations accessible to the current user, including the Windows Startup directory. This allows execution of arbitrary executables. Critically, when chained with CVE‑2026‑42248 (Missing Signature Verification for Updates), an attacker can deliver malicious payloads that are written to sensitive locations and executed automatically. Because Ollama for Windows performs silent automatic updates and executes staged binaries without user interaction, this results in automatic and persistent code execution 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.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: cvd@cert.pl
Published: 29-Apr-2026 19:16
Last Modified: 17-Jun-2026 17:47
EPSS Date: 2026-10-12
CWE: CWE-22, CWE-494

CVSS Vector


            CVSS:4.0                            AV:A /
                            AC:H /
                            AT:P /
                            PR:N /
                            UI:N /
                            VC:H /
                            VI:H /
                            VA:H /
                            SC:L /
                            SI:L /
                            SA:L /
                            E:X /
                            CR:X /
                            IR:X /
                            AR:X /
                            MAV:X /
                            MAC:X /
                            MAT:X /
                            MPR:X /
                            MUI:X /
                            MVC:X /
                            MVI:X /
                            MVA:X /
                            MSC:X /
                            MSI:X /
                            MSA:X /
                            S:X /
                            AU:X /
                            R:X /
                            V:X /
                            RE:X /
                            U:X

Affected Products / Versions

ollama / ollama
Version / affected range: * · from (inclusive) 0.12.10 · through (inclusive) 0.17.5
cpe:2.3:a:ollama:ollama:*:*:*:*:*:*:*:*

References

Last enrichment sync: 13-Oct-2026 17:09
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

CVE reference: CVE-2026-42249 Metasploit Update Adds Exploit Modules, Windows AArch64 Payloads and Enhancements

CVE (8)

People (10)

Products (8)

Tools (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.