CVE-2026-42248
Last modified
CVE-2026-42248 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:4.0/AV:A/AC:L/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
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ollama | Ollama | >= 0.12.10, <= 0.17.5 |
References
- https://cert.pl/en/posts/2026/04/CVE-2026-42248/Third Party Advisory
- https://ollama.com/Product
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-42248?
How severe is CVE-2026-42248?
How do I fix CVE-2026-42248?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-42238Nginx UI is a web user interface for the Nginx web server. P…9.8
- CVE-2026-42239Budibase is an open-source low-code platform. Prior to versi…8.1
- CVE-2026-4224When an Expat parser with a registered ElementDeclHandler pa…7.5
- CVE-2026-42241ParquetSharp is a .NET library for reading and writing Apach…5.3
- CVE-2026-42245Net::IMAP implements Internet Message Access Protocol (IMAP)…7.5
- CVE-2026-42246Net::IMAP implements Internet Message Access Protocol (IMAP)…7.4
- CVE-2026-42249Ollama for Windows contains a Remote Code Execution vulnerab…9.8
- CVE-2026-4225A security flaw has been discovered in CMS Made Simple up to…2.4
- CVE-2026-42250bzip2 contains an off‑by‑one error in the bzip2recover utili…4.8
- CVE-2026-42251Use of hard-coded credentials in KS-SOMED allowed an unautho…8.7
- CVE-2026-42252Apache Airflow's official documentation at `core-concepts/da…9.1
- CVE-2026-42253Improper Neutralization of Input During Web Page Generation …6.1
Are you affected by CVE-2026-42248?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST