Ollama downloadBlob Improper Validation of Array Index Denial-of-Service Vulnerability

Description

Ollama downloadBlob Improper Validation of Array Index Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Ollama. Authentication is not required to exploit this vulnerability. The specific flaw exists within the downloadBlob function. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated array. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-27277.

Scores

EPSS (exploitation in 30 days)

0.71% · top 46% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

• CWE-129: Improper Validation of Array Index (opens in a new tab)All about CWE-129 and its CVEs

Affected products

• Ollama · Ollama

  • affected 0.7.1

References (1)

• ZDI-26-403 (opens in a new tab)x_research-advisory

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-15685](https://trackcve.app/badge/CVE-2026-15685.svg)](https://trackcve.app/cve/CVE-2026-15685)

Record last updated 14 Jul 2026, 13:05 UTC.