CVE-2026-15685: Ollama downloadBlob Improper Validation of Array Index Denial-of-Service Vulnerability

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HIGH 7.5REMOTEDOWNGRADE

CVE-2026-15685 is a high-severity flaw (CVSS 7.5) affecting ollama. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-129
Published	2026-07-13
Last modified	2026-07-14

Publisher (CNA): Zero Day Initiative · Vendor: ollama

Last updated 2026-07-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-13 22:16 UTCPublished CVE record published
2026-07-14 20:59 UTCUpdated Record last modified

ollama ollama DOWNGRADE

Affected: 0.7.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.7.1

1. Check installed version

apt-cache policy ollama || rpm -q ollama || ollama --version

2. No fixed release: DOWNGRADE to a release before 0.7.1 (Debian / Ubuntu)

apt-cache madison ollama sudo apt install ollama=<VERSION_BEFORE_0.7.1> sudo apt-mark hold ollama

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ollama sudo dnf downgrade ollama-<VERSION_BEFORE_0.7.1> sudo dnf versionlock add ollama

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-15685?

ollama: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-15685 being exploited?

CVE-2026-15685 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-15685 affect?

CVE-2026-15685 affects ollama. Severity is high (CVSS 7.5). 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 t

How urgent is CVE-2026-15685?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-5757 HIGH 7.5 UPGRADE Unauthenticated remote information disclosure vulnerability in Ollama's model quantization engine allows an at

References

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