CVE-2026-42248
CriticalSummary
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, allowing attacker-supplied executables to be accepted and later executed by the application.
Risk Assessment
Malicious payloads may be installed automatically without user awareness, posing a significant threat to the security of the system and the organization's data.
Recommendation
It is recommended to immediately update Ollama to the latest version that is not vulnerable to this issue and to implement additional update verification mechanisms.
Related vulnerabilities
- CVE-2026-96207Critical
Improper certificate validation in Microsoft Partner Center allows an unauthorized attacker to elevate privileges over a network.
- CVE-2026-94510Critical
Authorization bypass through user-controlled key in Microsoft Bookings allows an unauthorized attacker to elevate privileges over a network.
- CVE-2026-88131Critical
Deserialization of untrusted data in Microsoft Dataverse allows an unauthorized attacker to execute code over a network.
- CVE-2026-77900Critical
Missing authentication for a critical function in Azure App Service allows an unauthorized attacker to execute code over a network.
- CVE-2026-69435Critical
Missing authorization in Azure SRE Agent allows an authorized attacker to elevate privileges over a network.
- CVE-2026-84249Critical
IBM Guardium Data Protection 12.2 and 12.2.2 could allow a remote attacker to execute arbitrary management operations due to missing authentication for a critical function.
- CVE-2026-80381Critical
IBM Guardium Data Protection 12.0, 12.1, and 12.2 could allow a remote attacker to execute unauthorized SQL statements due to SQL injection.
- CVE-2026-75875Critical
IBM Guardium Data Protection 12.0, 12.1, and 12.2 could allow a remote attacker to execute arbitrary code due to path traversal.
- CVE-2026-107726Critical
Hazelcast prior to 5.4.5, 5.5.10, and 5.6.1 contains improper validation of data supplied by a malicious client able to connect to a cluster, allowing arbitrary reads from a cluster member's Java heap, off-heap data, and JVM process address space. The same flaw can crash cluster members and, in some Hazelcast Enterprise Edition configurations, corrupt memory with possible arbitrary code execution. This issue is fixed in versions 5.4.5, 5.5.10, 5.6.1, and 5.7.0.
- CVE-2026-107722Critical
fast-jwt from 6.2.0 until 6.3.0 can misclassify RSA public-key text as an HMAC secret when the key has non-whitespace content before its PEM header. In src/crypto.js, performDetectPublicKeyAlgorithms trims whitespace but publicKeyPemMatcher remains start-anchored, so comments, control characters, zero-width characters, or wrapper text can prevent PEM detection and reach the HMAC fallback. An attacker who knows the public key bytes can sign arbitrary HS256 claims with that public material when HS256 is inferred or allowed, resulting in authentication or authorization bypass. An asymmetric-only algorithm allowlist prevents the attack. This issue is fixed in version 6.3.0.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS